[PATCH 055/241] drm: restore open_count if drm_setup fails

[Herton Ronaldo Krzesinski]

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

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

From: Ilija Hadzic <ilijahadzic at gmail.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 at research.bell-labs.com>
Reviewed-by: Thomas Hellstrom <thellstrom at vmware.com>
Signed-off-by: Dave Airlie <airlied at redhat.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/gpu/drm/drm_fops.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 123de28..b90abff 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -139,8 +139,11 @@ int drm_open(struct inode *inode, struct file *filp)
 	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);
-- 
1.7.9.5