From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Tue, 26 Jan 2016 19:55:35 +0000 (-0800)
Subject: f2fs: use wq_has_sleeper for cp_wait wait_queue
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=7c506896cf933a07460dd9777ac023382446beac;p=deliverable%2Flinux.git

f2fs: use wq_has_sleeper for cp_wait wait_queue

We need to use wq_has_sleeper including smp_mb to consider cp_wait concurrency.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 16cf8f0bc55f..90b3a3726d80 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -74,8 +74,7 @@ static void f2fs_write_end_io(struct bio *bio)
 		dec_page_count(sbi, F2FS_WRITEBACK);
 	}
 
-	if (!get_pages(sbi, F2FS_WRITEBACK) &&
-			!list_empty(&sbi->cp_wait.task_list))
+	if (!get_pages(sbi, F2FS_WRITEBACK) && wq_has_sleeper(&sbi->cp_wait))
 		wake_up(&sbi->cp_wait);
 
 	bio_put(bio);