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linux/drivers/block
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Ming Lei f6f465b98a virtio_blk: fix race between start and stop queue 
commit aa0818c6ee upstream.

When there isn't enough vring descriptor for adding to vq,
blk-mq will be put as stopped state until some of pending
descriptors are completed & freed.

Unfortunately, the vq's interrupt may come just before
blk-mq's BLK_MQ_S_STOPPED flag is set, so the blk-mq will
still be kept as stopped even though lots of descriptors
are completed and freed in the interrupt handler. The worst
case is that all pending descriptors are freed in the
interrupt handler, and the queue is kept as stopped forever.

This patch fixes the problem by starting/stopping blk-mq
with holding vq_lock.

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2014-06-11 11:54:10 -07:00
..
aoe mm: close PageTail race 2014-03-04 07:55:47 -08:00
drbd block: Immutable bio vecs 2013-11-23 22:33:49 -08:00
mtip32xx mtip32xx: mtip_async_complete() bug fixes 2014-05-06 07:59:34 -07:00
paride drivers/block/paride/pg.c: underflow bug in pg_write() 2014-01-21 20:16:56 -08:00
rsxx block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
xen-blkback xen-blkback: init persistent_purge_work work_struct 2014-02-11 20:34:03 -07:00
zram zram: avoid null access when fail to alloc meta 2014-03-04 07:55:49 -08:00
amiflop.c tree-wide: use reinit_completion instead of INIT_COMPLETION 2013-11-15 09:32:21 +09:00
ataflop.c block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
brd.c block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
cciss.c drivers/block/cciss.c:cciss_init_one(): use proper errnos 2014-01-21 20:16:56 -08:00
cciss.h cciss: Adds simple mode functionality 2011-08-08 11:40:15 +02:00
cciss_cmd.h cciss: use new doorbell-bit-5 reset method 2011-05-06 08:23:55 -06:00
cciss_scsi.c cciss: switch to ->show_info() 2013-04-09 14:13:19 -04:00
cciss_scsi.h cciss: add cciss_tape_cmds module paramter 2011-05-06 08:23:59 -06:00
cpqarray.c cpqarray: fix info leak in ida_locked_ioctl() 2013-09-24 17:00:26 -07:00
cpqarray.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cryptoloop.c move linux/loop.h to drivers/block 2013-06-29 12:46:45 +04:00
DAC960.c procfs: new helper - PDE_DATA(inode) 2013-04-09 14:13:32 -04:00
DAC960.h Fix DAC960 driver on machines which don't support 64-bit DMA 2007-09-11 17:21:19 -07:00
floppy.c floppy: don't write kernel-only members to FDRAWCMD ioctl output 2014-05-13 13:32:47 +02:00
hd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ida_cmd.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ida_ioctl.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Kconfig zram: promote zram from staging 2014-01-30 16:56:55 -08:00
loop.c drivers/block/loop.c: fix comment typo in loop_config_discard 2014-01-21 20:16:56 -08:00
loop.h move linux/loop.h to drivers/block 2013-06-29 12:46:45 +04:00
Makefile zram: promote zram from staging 2014-01-30 16:56:55 -08:00
mg_disk.c mg_disk: Spelling s/finised/finished/ 2014-01-21 20:34:58 -08:00
nbd.c block: Immutable bio vecs 2013-11-23 22:33:49 -08:00
null_blk.c null_blk: use blk_complete_request and blk_mq_complete_request 2014-02-10 09:27:31 -07:00
nvme-core.c Merge git://git.infradead.org/users/willy/linux-nvme 2014-02-05 15:53:26 -08:00
nvme-scsi.c NVMe: compat SG_IO ioctl 2013-12-16 15:49:40 -05:00
osdblk.c block: replace strict_strtoul() with kstrtoul() 2013-09-11 15:56:56 -07:00
pktcdvd.c pktcdvd: fix error return code 2014-01-03 10:05:34 +01:00
ps3disk.c block: Kill bio_segments()/bi_vcnt usage 2013-11-23 22:33:51 -08:00
ps3vram.c block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
rbd.c rbd: fix error paths in rbd_img_request_fill() 2014-05-31 13:20:28 -07:00
rbd_types.h rbd: get rid of RBD_MAX_SEG_NAME_LEN 2012-12-17 08:37:29 -06:00
skd_main.c drivers: block: Mark the functions as static in skd_main.c 2013-12-19 08:06:49 -07:00
skd_s1120.h skd: fix formatting in skd_s1120.h 2013-11-08 09:10:30 -07:00
smart1,2.h fix typos 'comamnd' -> 'command' in comments 2011-02-02 11:31:21 +01:00
sunvdc.c sunvdc: Fix off-by-one in generic_request(). 2013-02-14 11:49:01 -08:00
swim.c drivers/block/swim.c: remove unnecessary platform_set_drvdata() 2013-09-11 15:56:59 -07:00
swim3.c block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
swim_asm.S m68k: mac - Add SWIM floppy support 2009-03-26 21:15:27 +01:00
sx8.c drivers/block/sx8.c: remove unnecessary pci_set_drvdata() 2014-01-21 20:16:56 -08:00
umem.c block: Convert drivers to immutable biovecs 2013-11-23 22:33:51 -08:00
umem.h drivers/block/umem: trim trailing whitespace 2007-10-10 09:25:59 +02:00
virtio_blk.c virtio_blk: fix race between start and stop queue 2014-06-11 11:54:10 -07:00
xen-blkfront.c Merge branch 'stable/for-jens-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip into for-linus 2014-02-10 12:52:34 -07:00
xsysace.c xilinx systemace: Fix sparse warnings 2013-07-10 07:47:12 +02:00
z2ram.c block/z2ram: Remove duplicate external declarations 2013-11-26 11:09:10 +01:00