linux-kernel - [PATCH] ubifs: Fix WARN

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Message-Id: <20181013081841.13369-1-richard@nod.at>
Date:   Sat, 13 Oct 2018 10:18:41 +0200
From:   Richard Weinberger <richard@....at>
To:     gregkh@...uxfoundation.org
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dunlap@...radead.org, Richard Weinberger <richard@....at>
Subject: [PATCH] ubifs: Fix WARN_ON logic in exit path

ubifs_assert() is not WARN_ON(), so we have to invert
the checks.
Randy faced this warning with UBIFS being a module, since
most users use UBIFS as builtin because UBIFS is the rootfs
nobody noticed so far. :-(
Including me.

Reported-by: Randy Dunlap <rdunlap@...radead.org>
Fixes: 54169ddd382d ("ubifs: Turn two ubifs_assert() into a WARN_ON()")
Signed-off-by: Richard Weinberger <richard@....at>
---
Greg,

can you please take this patch directly?
It fixes a brown paper bug which was introduced in rc1, I'd like to avoid
having it in a release and going the -stable path.

Thanks,
//richard
---
 fs/ubifs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index bf000c8aeffb..fec62e9dfbe6 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2337,8 +2337,8 @@ late_initcall(ubifs_init);
 
 static void __exit ubifs_exit(void)
 {
-	WARN_ON(list_empty(&ubifs_infos));
-	WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
+	WARN_ON(!list_empty(&ubifs_infos));
+	WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0);
 
 	dbg_debugfs_exit();
 	ubifs_compressors_exit();
-- 
2.19.1