drm/gem: fix not to assign error value to gem name

If idr_alloc() is failed, obj->name can be error value. Also
it cleans up duplicated flink processing code.

This regression has been introduced in

commit 2e928815c1886fe628ed54623aa98d0889cf5509
Author: Tejun Heo <tj@kernel.org>
Date:   Wed Feb 27 17:04:08 2013 -0800

    drm: convert to idr_alloc()

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: stable@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 34c0be7..bcedaf7 100644 (file)
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -453,25 +453,21 @@ drm_gem_flink_ioctl(struct drm_device *dev, void *data,
        spin_lock(&dev->object_name_lock);
        if (!obj->name) {
                ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT);
-               obj->name = ret;
-               args->name = (uint64_t) obj->name;
-               spin_unlock(&dev->object_name_lock);
-               idr_preload_end();
-
                if (ret < 0)
                        goto err;
-               ret = 0;
+
+               obj->name = ret;
 
                /* Allocate a reference for the name table.  */
                drm_gem_object_reference(obj);
-       } else {
-               args->name = (uint64_t) obj->name;
-               spin_unlock(&dev->object_name_lock);
-               idr_preload_end();
-               ret = 0;
        }
 
+       args->name = (uint64_t) obj->name;
+       ret = 0;
+
 err:
+       spin_unlock(&dev->object_name_lock);
+       idr_preload_end();
        drm_gem_object_unreference_unlocked(obj);
        return ret;
 }