Patch "f2fs: wake up all waiters in f2fs_submit_discard_endio" has been added to the 4.12-stable tree

Patch "f2fs: wake up all waiters in f2fs_submit_discard_endio" has been added to the 4.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    f2fs: wake up all waiters in f2fs_submit_discard_endio

to the 4.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     f2fs-wake-up-all-waiters-in-f2fs_submit_discard_endio.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e31b98215779e66a490471c6ad886ae231316699 Mon Sep 17 00:00:00 2001
From: Chao Yu <yuchao0@huawei.com>
Date: Fri, 19 May 2017 23:46:44 +0800
Subject: f2fs: wake up all waiters in f2fs_submit_discard_endio

From: Chao Yu <yuchao0@huawei.com>

commit e31b98215779e66a490471c6ad886ae231316699 upstream.

There could be more than one waiter waiting discard IO completion, so we
need use complete_all() instead of complete() in f2fs_submit_discard_endio
to avoid hungtask.

Fixes: 	ec9895add2c5 ("f2fs: don't hold cmd_lock during waiting discard
command")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/f2fs/segment.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -751,7 +751,7 @@ static void f2fs_submit_discard_endio(st
 
 	dc->error = bio->bi_error;
 	dc->state = D_DONE;
-	complete(&dc->wait);
+	complete_all(&dc->wait);
 	bio_put(bio);
 }
 


Patches currently in stable-queue which might be from yuchao0@huawei.com are

queue-4.12/f2fs-don-t-clear-sgid-when-inheriting-acls.patch
queue-4.12/f2fs-use-spin_-un-lock_irq-save-restore.patch
queue-4.12/f2fs-sanity-check-size-of-nat-and-sit-cache.patch
queue-4.12/f2fs-wake-up-all-waiters-in-f2fs_submit_discard_endio.patch
queue-4.12/f2fs-do-not-issue-small-discards-in-lfs-mode.patch