drm: Avoid client deadlocks when the master disappears.

[pandora-kernel.git] / drivers / gpu / drm / drm_fops.c

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 6c020fe..f52663e 100644 (file)
--- 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);