1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 6c020fe5431c..f52663ebe016 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -484,6 +484,7 @@ int drm_release(struct inode *inode, struct file *filp)
         mutex_lock(&dev->struct_mutex);
 
         if (file_priv->is_master) {
+                struct drm_master *master = file_priv->master;
                 struct drm_file *temp;
                 list_for_each_entry(temp, &dev->filelist, lhead) {
                         if ((temp->master == file_priv->master) &&
@@ -491,6 +492,19 @@ int drm_release(struct inode *inode, struct file *filp)
                                 temp->authenticated = 0;
                 }
 
+                /**
+                 * Since the master is disappearing, so is the
+                 * possibility to lock.
+                 */
+
+                if (master->lock.hw_lock) {
+                        if (dev->sigdata.lock == master->lock.hw_lock)
+                                dev->sigdata.lock = NULL;
+                        master->lock.hw_lock = NULL;
+                        master->lock.file_priv = NULL;
+                        wake_up_interruptible_all(&master->lock.lock_queue);
+                }
+
                 if (file_priv->minor->master == file_priv->master) {
                         /* drop the reference held my the minor */
                         drm_master_put(&file_priv->minor->master);