1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 13fdcd10a605..429e07d0b0f1 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -123,6 +123,7 @@ int drm_open(struct inode *inode, struct file *filp)
         int retcode = 0;
         int need_setup = 0;
         struct address_space *old_mapping;
+        struct address_space *old_imapping;
 
         minor = idr_find(&drm_minors_idr, minor_id);
         if (!minor)
@@ -137,6 +138,7 @@ int drm_open(struct inode *inode, struct file *filp)
         if (!dev->open_count++)
                 need_setup = 1;
         mutex_lock(&dev->struct_mutex);
+        old_imapping = inode->i_mapping;
         old_mapping = dev->dev_mapping;
         if (old_mapping == NULL)
                 dev->dev_mapping = &inode->i_data;
@@ -159,8 +161,8 @@ int drm_open(struct inode *inode, struct file *filp)
 
 err_undo:
         mutex_lock(&dev->struct_mutex);
-        filp->f_mapping = old_mapping;
-        inode->i_mapping = old_mapping;
+        filp->f_mapping = old_imapping;
+        inode->i_mapping = old_imapping;
         iput(container_of(dev->dev_mapping, struct inode, i_data));
         dev->dev_mapping = old_mapping;
         mutex_unlock(&dev->struct_mutex);