tree 13837ef8dc9e955c621d798235c064218b56361d
parent bc64863814b14a4f75884746e68d3bf9f96b3559
author Andrew Morton <akpm@osdl.org> 1151239666 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1151254866 -0700

[PATCH] pdflush: handle resume wakeups

pdflush is carefully designed to ensure that all wakeups have some
corresponding work to do - if a woken-up pdflush thread discovers that it
hasn't been given any work to do then this is considered an error.

That all broke when swsusp came along - because a timer-delivered wakeup to a
frozen pdflush thread will just get lost.  This causes the pdflush thread to
get lost as well: the writeback timer is supposed to be re-armed by pdflush in
process context, but pdflush doesn't execute the callout which does this.

Fix that up by ignoring the return value from try_to_freeze(): jsut proceed,
see if we have any work pending and only go back to sleep if that is not the
case.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>