linux-kernel - [ 16/38] drm: restore open_count if drm

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Message-Id: <20121115040933.915875103@linuxfoundation.org>
Date:	Wed, 14 Nov 2012 20:10:13 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Ilija Hadzic <ihadzic@...earch.bell-labs.com>,
	Thomas Hellstrom <thellstrom@...are.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 16/38] drm: restore open_count if drm_setup fails

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

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

From: Ilija Hadzic <ilijahadzic@...il.com>

commit 0f1cb1bd94a9c967cd4ad3de51cfdabe61eb5dcc upstream.

If drm_setup (called at first open) fails, the whole
open call has failed, so we should not keep the
open_count incremented.

Signed-off-by: Ilija Hadzic <ihadzic@...earch.bell-labs.com>
Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/drm_fops.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -135,8 +135,11 @@ int drm_open(struct inode *inode, struct
 	retcode = drm_open_helper(inode, filp, dev);
 	if (!retcode) {
 		atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
-		if (!dev->open_count++)
+		if (!dev->open_count++) {
 			retcode = drm_setup(dev);
+			if (retcode)
+				dev->open_count--;
+		}
 	}
 	if (!retcode) {
 		mutex_lock(&dev->struct_mutex);


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