tree 434d3614e79458bc86e64a61034cbe9448177ea5
parent abb97b8c502a270d59c0c2e1ecea78ad752372ee
author Jens Axboe <axboe@fb.com> 1392222841 -0700
committer Jens Axboe <axboe@fb.com> 1392222997 -0700

block: add cond_resched() to potentially long running ioctl discard loop

When mkfs issues a full device discard and the device only
supports discards of a smallish size, we can loop in
blkdev_issue_discard() for a long time. If preempt isn't enabled,
this can turn into a softlock situation and the kernel will
start complaining.

Add an explicit cond_resched() at the end of the loop to avoid
that.

Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>