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| author | Bart Van Assche <[email protected]> | 2012-12-06 13:32:01 +0000 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2012-12-06 13:32:01 +0000 |
| commit | c246e80d86736312933646896c4157daf511dadc (patch) | |
| tree | 183119080e120f5a3e98edf5bb824e940e5b8f18 /fs/proc/array.c | |
| parent | block: Let blk_drain_queue() caller obtain the queue lock (diff) | |
| download | kernel-c246e80d86736312933646896c4157daf511dadc.tar.gz kernel-c246e80d86736312933646896c4157daf511dadc.zip | |
block: Avoid that request_fn is invoked on a dead queue
A block driver may start cleaning up resources needed by its
request_fn as soon as blk_cleanup_queue() finished, so request_fn
must not be invoked after draining finished. This is important
when blk_run_queue() is invoked without any requests in progress.
As an example, if blk_drain_queue() and scsi_run_queue() run in
parallel, blk_drain_queue() may have finished all requests after
scsi_run_queue() has taken a SCSI device off the starved list but
before that last function has had a chance to run the queue.
Signed-off-by: Bart Van Assche <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: Chanho Min <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'fs/proc/array.c')
0 files changed, 0 insertions, 0 deletions