[PATCH 3/3] coredump: change wait_for_dump_helpers() to use wait_event_interruptible()

[Oleg Nesterov <oleg@redhat.com>]

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>
---
 fs/coredump.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 477f393..667413c 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -439,17 +439,20 @@ static void wait_for_dump_helpers(struct file *file)
 	pipe_lock(pipe);
 	pipe->readers++;
 	pipe->writers--;
+	wake_up_interruptible_sync(&pipe->wait);
+	kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+	pipe_unlock(pipe);
 
-	while ((pipe->readers > 1) && (!signal_pending(current))) {
-		wake_up_interruptible_sync(&pipe->wait);
-		kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
-		pipe_wait(pipe);
-	}
+	/*
+	 * We actually want wait_event_freezable() but then we need
+	 * to clear TIF_SIGPENDING and improve dump_interrupted().
+	 */
+	wait_event_interruptible(pipe->wait, pipe->readers == 1);
 
+	pipe_lock(pipe);
 	pipe->readers--;
 	pipe->writers++;
 	pipe_unlock(pipe);
-
 }
 
 /*
-- 
1.5.5.1