linux-kernel - [096/102] GFS2: Fix mount hang caused by certain access pattern to sysfs files

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Message-Id: <20110803221253.754676040@clark.kroah.org>
Date:	Wed, 03 Aug 2011 15:01:56 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [096/102] GFS2: Fix mount hang caused by certain access pattern to sysfs files

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Steven Whitehouse <swhiteho@...hat.com>

commit 19237039919088781b4191a00bdc1284d8fea1dd upstream.

Depending upon the order of userspace/kernel during the
mount process, this can result in a hang without the
_all version of the completion.

Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/gfs2/ops_fstype.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1018,13 +1018,13 @@ hostdata_error:
 		fsname++;
 	if (lm->lm_mount == NULL) {
 		fs_info(sdp, "Now mounting FS...\n");
-		complete(&sdp->sd_locking_init);
+		complete_all(&sdp->sd_locking_init);
 		return 0;
 	}
 	ret = lm->lm_mount(sdp, fsname);
 	if (ret == 0)
 		fs_info(sdp, "Joined cluster. Now mounting FS...\n");
-	complete(&sdp->sd_locking_init);
+	complete_all(&sdp->sd_locking_init);
 	return ret;
 }
 


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