tree fff5197359b989197eda76dd019746fbba054e88
parent 337238be1bf52e1242f940fc6fe83fb395e55057
author Tejun Heo <tj@kernel.org> 1283507777 +0200
committer Jens Axboe <jaxboe@fusionio.com> 1284114937 +0200

block: kick queue after sequencing REQ_FLUSH/FUA

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>