block: kick queue after sequencing REQ_FLUSH/FUA

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While completing a request from a REQ_FLUSH/FUA sequence, another
request can be pushed to the request queue.  If a driver tests
elv_queue_empty() before completing a request and runs the queue again
only if the queue wasn't empty, this may lead to hang.  Please note
that most drivers either kick the queue unconditionally or test queue
emptiness after completing the current request and don't have this
problem.

This patch removes this possibility by making REQ_FLUSH/FUA sequence
code kick the queue if the queue was empty before completing a request
from REQ_FLUSH/FUA sequence.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

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Tejun Heo 2010-09-03 11:56:17 +02:00 • committed by Jens Axboe

parent 337238be1b

commit 47f70d5a6c

1 changed files with 19 additions and 3 deletions

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block/blk-flush.c

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