fuse: fix blocked_waitq wakeup

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commit 908a572b80 upstream.

Using waitqueue_active() is racy.  Make sure we issue a wake_up()
unconditionally after storing into fc->blocked.  After that it's okay to
optimize with waitqueue_active() since the first wake up provides the
necessary barrier for all waiters, not the just the woken one.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 3c18ef8117 ("fuse: optimize wake_up")
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Miklos Szeredi 2018-09-28 16:43:22 +02:00 • committed by Ben Hutchings

parent fa99de6c06

commit bfc89804cb

1 changed files with 11 additions and 4 deletions

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fs/fuse/dev.c

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