]> git.baikalelectronics.ru Git - kernel.git/commit
coredump: change wait_for_dump_helpers() to use wait_event_interruptible()
authorOleg Nesterov <oleg@redhat.com>
Tue, 30 Apr 2013 22:28:17 +0000 (15:28 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 1 May 2013 00:04:06 +0000 (17:04 -0700)
commit1ad49c7323783fe4dde766feb8fc81d78e216aa4
tree735a75c2d2455721dffed758632f07f62cbf2206
parentb36f69f4dcd45980ee2de025a1b296739a2b4b59
coredump: change wait_for_dump_helpers() to use wait_event_interruptible()

wait_for_dump_helpers() calls wake_up/kill_fasync from inside the
wait_event-like loop.  This is not needed and in fact this is not
strictly correct, we can/should do this only once after we change
pipe->writers.  We could even check if it becomes zero.

Change this code to use use wait_event_interruptible(), this can also
help to make this wait freezable.

With this patch we check pipe->readers without pipe_lock(), this is
fine.  Once we see pipe->readers == 1 we know that the handler
decremented the counter, this is all we need.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Mandeep Singh Baines <msb@chromium.org>
Cc: Neil Horman <nhorman@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/coredump.c