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@xxxxxxxxxxxxxxx> know about it. >From e31b98215779e66a490471c6ad886ae231316699 Mon Sep 17 00:00:00 2001 From: Chao Yu <yuchao0@xxxxxxxxxx> Date: Fri, 19 May 2017 23:46:44 +0800 Subject: f2fs: wake up all waiters in f2fs_submit_discard_endio From: Chao Yu <yuchao0@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxxxxx 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