tree c527bc3477255dfc0064390f2073533c6a652c2b
parent a5a79d00017c9eee68a9bcb40d5dfd6f45f17461
author Jens Axboe <axboe@fb.com> 1488488348 -0700
committer Jens Axboe <axboe@fb.com> 1488488348 -0700

block: don't call ioc_exit_icq() with the queue lock held for blk-mq

For legacy scheduling, we always call ioc_exit_icq() with both the
ioc and queue lock held. This poses a problem for blk-mq with
scheduling, since the queue lock isn't what we use in the scheduler.
And since we don't need the queue lock held for ioc exit there,
don't grab it and leave any extra locking up to the blk-mq scheduler.

Reported-by: Paolo Valente <paolo.valente@linaro.org>
Tested-by: Paolo Valente <paolo.valente@linaro.org>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>