[SCSI] hpsa: prevent stalled i/o

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If a fifo full condition is encountered, i/o requests will stack
up in the h->reqQ queue.  The only thing which empties this queue
is start_io, which only gets called when new i/o requests come in.
If none are forthcoming, i/o in h->reqQ will be stalled.

To fix this, whenever fifo full condition is encountered, this
is recorded, and the interrupt handler examines this to see
if a fifo full condition was recently encountered when a
command completes and will call start_io to prevent i/o's in
h->reqQ from getting stuck.

I've only ever seen this problem occur when running specialized
test programs that pound on the the CCISS_PASSTHRU ioctl.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

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Stephen M. Cameron 2013-09-23 13:34:17 -05:00 • committed by James Bottomley

parent 0390f0c0df

commit 396883e292

2 changed files with 31 additions and 2 deletions

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32

drivers/scsi/hpsa.c

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1

drivers/scsi/hpsa.h

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