dm cache policy mq: protect residency method with existing mutex

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It is safe to use a mutex in mq_residency() at this point since it is
only called from ioctl context.  But future-proof mq_residency() by
using might_sleep() to catch new contexts that cannot sleep.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Joe Thornber 2013-10-21 11:44:57 +01:00 • committed by Mike Snitzer

parent 9c1d4de560

commit 99ba2ae4cd

1 changed files with 6 additions and 2 deletions

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drivers/md/dm-cache-policy-mq.c

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