linux/drivers/block/cciss.c

4587 lines
128 KiB

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
[PATCH] getting rid of all casts of k[cmz]alloc() calls Run this: #!/bin/sh for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do echo "De-casting $f..." perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f done And then go through and reinstate those cases where code is casting pointers to non-pointers. And then drop a few hunks which conflicted with outstanding work. Cc: Russell King <rmk@arm.linux.org.uk>, Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Greg KH <greg@kroah.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Paul Fulghum <paulkf@microgate.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Karsten Keil <kkeil@suse.de> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Ian Kent <raven@themaw.net> Cc: Steven French <sfrench@us.ibm.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Neil Brown <neilb@cse.unsw.edu.au> Cc: Jaroslav Kysela <perex@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-13 00:35:56 -08:00
block: add rq->resid_len rq->data_len served two purposes - the length of data buffer on issue and the residual count on completion. This duality creates some headaches. First of all, block layer and low level drivers can't really determine what rq->data_len contains while a request is executing. It could be the total request length or it coulde be anything else one of the lower layers is using to keep track of residual count. This complicates things because blk_rq_bytes() and thus [__]blk_end_request_all() relies on rq->data_len for PC commands. Drivers which want to report residual count should first cache the total request length, update rq->data_len and then complete the request with the cached data length. Secondly, it makes requests default to reporting full residual count, ie. reporting that no data transfer occurred. The residual count is an exception not the norm; however, the driver should clear rq->data_len to zero to signify the normal cases while leaving it alone means no data transfer occurred at all. This reverse default behavior complicates code unnecessarily and renders block PC on some drivers (ide-tape/floppy) unuseable. This patch adds rq->resid_len which is used only for residual count. While at it, remove now unnecessasry blk_rq_bytes() caching in ide_pc_intr() as rq->data_len is not changed anymore. Boaz : spotted missing conversion in osd Sergei : spotted too early conversion to blk_rq_bytes() in ide-tape [ Impact: cleanup residual count handling, report 0 resid by default ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Darrick J. Wong <djwong@us.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:37 +09:00
block: add rq->resid_len rq->data_len served two purposes - the length of data buffer on issue and the residual count on completion. This duality creates some headaches. First of all, block layer and low level drivers can't really determine what rq->data_len contains while a request is executing. It could be the total request length or it coulde be anything else one of the lower layers is using to keep track of residual count. This complicates things because blk_rq_bytes() and thus [__]blk_end_request_all() relies on rq->data_len for PC commands. Drivers which want to report residual count should first cache the total request length, update rq->data_len and then complete the request with the cached data length. Secondly, it makes requests default to reporting full residual count, ie. reporting that no data transfer occurred. The residual count is an exception not the norm; however, the driver should clear rq->data_len to zero to signify the normal cases while leaving it alone means no data transfer occurred at all. This reverse default behavior complicates code unnecessarily and renders block PC on some drivers (ide-tape/floppy) unuseable. This patch adds rq->resid_len which is used only for residual count. While at it, remove now unnecessasry blk_rq_bytes() caching in ide_pc_intr() as rq->data_len is not changed anymore. Boaz : spotted missing conversion in osd Sergei : spotted too early conversion to blk_rq_bytes() in ide-tape [ Impact: cleanup residual count handling, report 0 resid by default ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Darrick J. Wong <djwong@us.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:37 +09:00
block: add rq->resid_len rq->data_len served two purposes - the length of data buffer on issue and the residual count on completion. This duality creates some headaches. First of all, block layer and low level drivers can't really determine what rq->data_len contains while a request is executing. It could be the total request length or it coulde be anything else one of the lower layers is using to keep track of residual count. This complicates things because blk_rq_bytes() and thus [__]blk_end_request_all() relies on rq->data_len for PC commands. Drivers which want to report residual count should first cache the total request length, update rq->data_len and then complete the request with the cached data length. Secondly, it makes requests default to reporting full residual count, ie. reporting that no data transfer occurred. The residual count is an exception not the norm; however, the driver should clear rq->data_len to zero to signify the normal cases while leaving it alone means no data transfer occurred at all. This reverse default behavior complicates code unnecessarily and renders block PC on some drivers (ide-tape/floppy) unuseable. This patch adds rq->resid_len which is used only for residual count. While at it, remove now unnecessasry blk_rq_bytes() caching in ide_pc_intr() as rq->data_len is not changed anymore. Boaz : spotted missing conversion in osd Sergei : spotted too early conversion to blk_rq_bytes() in ide-tape [ Impact: cleanup residual count handling, report 0 resid by default ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Darrick J. Wong <djwong@us.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:37 +09:00
block: add rq->resid_len rq->data_len served two purposes - the length of data buffer on issue and the residual count on completion. This duality creates some headaches. First of all, block layer and low level drivers can't really determine what rq->data_len contains while a request is executing. It could be the total request length or it coulde be anything else one of the lower layers is using to keep track of residual count. This complicates things because blk_rq_bytes() and thus [__]blk_end_request_all() relies on rq->data_len for PC commands. Drivers which want to report residual count should first cache the total request length, update rq->data_len and then complete the request with the cached data length. Secondly, it makes requests default to reporting full residual count, ie. reporting that no data transfer occurred. The residual count is an exception not the norm; however, the driver should clear rq->data_len to zero to signify the normal cases while leaving it alone means no data transfer occurred at all. This reverse default behavior complicates code unnecessarily and renders block PC on some drivers (ide-tape/floppy) unuseable. This patch adds rq->resid_len which is used only for residual count. While at it, remove now unnecessasry blk_rq_bytes() caching in ide_pc_intr() as rq->data_len is not changed anymore. Boaz : spotted missing conversion in osd Sergei : spotted too early conversion to blk_rq_bytes() in ide-tape [ Impact: cleanup residual count handling, report 0 resid by default ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: Mike Miller <mike.miller@hp.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Darrick J. Wong <djwong@us.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:37 +09:00
block: implement and enforce request peek/start/fetch Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request(). After that, drivers are free to either dequeue it or process it without dequeueing. Dequeue allows elv_next_request() to return the next request so that multiple requests can be in flight. Executing requests without dequeueing has its merits mostly in allowing drivers for simpler devices which can't do sg to deal with segments only without considering request boundary. However, the benefit this brings is dubious and declining while the cost of the API ambiguity is increasing. Segment based drivers are usually for very old or limited devices and as converting to dequeueing model isn't difficult, it doesn't justify the API overhead it puts on block layer and its more modern users. Previous patches converted all block low level drivers to dequeueing model. This patch completes the API transition by... * renaming elv_next_request() to blk_peek_request() * renaming blkdev_dequeue_request() to blk_start_request() * adding blk_fetch_request() which is combination of peek and start * disallowing completion of queued (not started) requests * applying new API to all LLDs Renamings are for consistency and to break out of tree code so that it's apparent that out of tree drivers need updating. [ Impact: block request issue API cleanup, no functional change ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Mike Miller <mike.miller@hp.com> Cc: unsik Kim <donari75@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: David S. Miller <davem@davemloft.net> Cc: Laurent Vivier <Laurent@lvivier.info> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Pierre Ossman <drzeus@drzeus.cx> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Cc: Stefan Weinhuber <wein@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-08 11:54:16 +09:00
block: implement and enforce request peek/start/fetch Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request(). After that, drivers are free to either dequeue it or process it without dequeueing. Dequeue allows elv_next_request() to return the next request so that multiple requests can be in flight. Executing requests without dequeueing has its merits mostly in allowing drivers for simpler devices which can't do sg to deal with segments only without considering request boundary. However, the benefit this brings is dubious and declining while the cost of the API ambiguity is increasing. Segment based drivers are usually for very old or limited devices and as converting to dequeueing model isn't difficult, it doesn't justify the API overhead it puts on block layer and its more modern users. Previous patches converted all block low level drivers to dequeueing model. This patch completes the API transition by... * renaming elv_next_request() to blk_peek_request() * renaming blkdev_dequeue_request() to blk_start_request() * adding blk_fetch_request() which is combination of peek and start * disallowing completion of queued (not started) requests * applying new API to all LLDs Renamings are for consistency and to break out of tree code so that it's apparent that out of tree drivers need updating. [ Impact: block request issue API cleanup, no functional change ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Mike Miller <mike.miller@hp.com> Cc: unsik Kim <donari75@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: David S. Miller <davem@davemloft.net> Cc: Laurent Vivier <Laurent@lvivier.info> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Pierre Ossman <drzeus@drzeus.cx> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Cc: Stefan Weinhuber <wein@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-08 11:54:16 +09:00
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:39 +09:00
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:39 +09:00
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:39 +09:00
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 22:24:39 +09:00
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
[PATCH] cciss: fix use-after-free in cciss_init_one free_hba() sets hba[i] to NULL, the dereference afterwards results in this crash. Setting busy_initializing to 0 actually looks unnecessary, but I'm not entirely sure, which is why I left it in. cciss: controller appears to be disabled Unable to handle kernel NULL pointer dereference at virtual address 00000370 printing eip: c1114d53 *pde = 00000000 Oops: 0002 [#1] Modules linked in: CPU: 0 EIP: 0060:[<c1114d53>] Not tainted VLI EFLAGS: 00010286 (2.6.16 #1) EIP is at cciss_init_one+0x4e9/0x4fe eax: 00000000 ebx: c132cd60 ecx: c13154e4 edx: c27d3c00 esi: 00000000 edi: c2748800 ebp: c2536ee4 esp: c2536eb8 ds: 007b es: 007b ss: 0068 Process swapper (pid: 1, threadinfo=c2536000 task=c2535a30) Stack: <0>00000000 00000000 00000000 c13fdba0 c2536ee8 c13159c0 c2536f38 f7c74740 c132cd60 c132cd60 ffffffed c2536ef0 c10c1d51 c2748800 c2536f04 c10c1d85 c132cd60 c2748800 c132cd8c c2536f14 c10c1db8 c2748848 00000000 c2536f28 Call Trace: [<c10031d5>] show_stack_log_lvl+0xa8/0xb0 [<c1003305>] show_registers+0x102/0x16a [<c10034a2>] die+0xc1/0x13c [<c1288160>] do_page_fault+0x38a/0x525 [<c1002e9b>] error_code+0x4f/0x54 [<c10c1d51>] pci_call_probe+0xd/0x10 [<c10c1d85>] __pci_device_probe+0x31/0x43 [<c10c1db8>] pci_device_probe+0x21/0x34 [<c110a654>] driver_probe_device+0x44/0x99 [<c110a73f>] __driver_attach+0x39/0x5d [<c1109e1c>] bus_for_each_dev+0x35/0x5a [<c110a777>] driver_attach+0x14/0x16 [<c110a220>] bus_add_driver+0x5c/0x8f [<c110ab22>] driver_register+0x73/0x78 [<c10c1f6d>] __pci_register_driver+0x5f/0x71 [<c13bf935>] cciss_init+0x1a/0x1c [<c13aa718>] do_initcalls+0x4c/0x96 [<c13aa77e>] do_basic_setup+0x1c/0x1e [<c10002b1>] init+0x35/0x118 [<c1000cf5>] kernel_thread_helper+0x5/0xb Code: 04 b5 e0 de 40 c1 8d 50 04 8b 40 34 e8 3f b7 f9 ff 8b 04 b5 e0 de 40 c1 e8 aa f3 ff ff 89 f0 e8 e8 fa ff ff 8b 04 b5 e0 de 40 c1 <c7> 80 70 03 00 00 00 00 00 00 83 c8 ff 8d 65 f4 5b 5e 5f 5d c3 <0>Kernel panic - not syncing: Attempted to kill init! Signed-off-by: Patrick McHardy <kaber@trash.net> Cc: <mike.miller@hp.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 02:59:24 -08:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00
[PATCH] cciss: unregister from SCSI before tearing down device resources We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-04-11 23:28:43 -07:00