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(parent: 8bc7d62) | patch
blk-mq: fix potential race in queue restart and driver tag allocation
authorJens Axboe <axboe@fb.com>
Thu, 26 Jan 2017 19:50:36 +0000 (12:50 -0700)
committerJens Axboe <axboe@fb.com>
Fri, 27 Jan 2017 15:20:31 +0000 (08:20 -0700)
commitb246cfa57bd67d26c2d03e83497f14ef130d8c93
treea34fce71ed855738dd53b3e66594446a23df7319tree | snapshot
parent8bc7d6254389b09c2c01ad424b23820a4c2707a4commit | diff
blk-mq: fix potential race in queue restart and driver tag allocation

Once we mark the queue as needing a restart, re-check if we can
get a driver tag. This fixes a theoretical issue where the needed
IO completes _after_ blk_mq_get_driver_tag() fails, but before we
manage to set the restart bit.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Tested-by: Hannes Reinecke <hare@suse.com>
block/blk-mq.c diff | blob | history
Linux Kernel Source Tree.