From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 1 May 2017 00:08:05 +0000 (-0400)
Subject: ext4: replace BUG_ON with WARN_ONCE in ext4_end_bio()
X-Git-Tag: v4.12-rc1~73^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=72d622b42258a0ed0b6e8c0f40d7628de935d058;p=platform%2Fkernel%2Flinux-exynos.git

ext4: replace BUG_ON with WARN_ONCE in ext4_end_bio()

Add fallback code and a WARN_ONCE() call instead of a BUG_ON() in
the ext4_end_bio() function.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 208241b..1a82138 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -297,8 +297,17 @@ static void ext4_end_bio(struct bio *bio)
 {
 	ext4_io_end_t *io_end = bio->bi_private;
 	sector_t bi_sector = bio->bi_iter.bi_sector;
+	char b[BDEVNAME_SIZE];
 
-	BUG_ON(!io_end);
+	if (WARN_ONCE(!io_end, "io_end is NULL: %s: sector %Lu len %u err %d\n",
+		      bdevname(bio->bi_bdev, b),
+		      (long long) bio->bi_iter.bi_sector,
+		      (unsigned) bio_sectors(bio),
+		      bio->bi_error)) {
+		ext4_finish_bio(bio);
+		bio_put(bio);
+		return;
+	}
 	bio->bi_end_io = NULL;
 
 	if (bio->bi_error) {