drm: use anon-inode instead of relying on cdevs

[platform/adaptation/renesas_rcar/renesas_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 c7881ad..88ebc2b 100644 (file)
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -83,8 +83,6 @@ int drm_open(struct inode *inode, struct file *filp)
        struct drm_minor *minor;
        int retcode;
        int need_setup = 0;
-       struct address_space *old_mapping;
-       struct address_space *old_imapping;
 
        minor = drm_minor_acquire(iminor(inode));
        if (IS_ERR(minor))
@@ -98,16 +96,9 @@ 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;
-       /* ihold ensures nobody can remove inode with our i_data */
-       ihold(container_of(dev->dev_mapping, struct inode, i_data));
-       inode->i_mapping = dev->dev_mapping;
-       filp->f_mapping = dev->dev_mapping;
-       mutex_unlock(&dev->struct_mutex);
+
+       /* share address_space across all char-devs of a single device */
+       filp->f_mapping = dev->anon_inode->i_mapping;
 
        retcode = drm_open_helper(inode, filp, dev);
        if (retcode)
@@ -120,12 +111,6 @@ int drm_open(struct inode *inode, struct file *filp)
        return 0;
 
 err_undo:
-       mutex_lock(&dev->struct_mutex);
-       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);
        dev->open_count--;
 err_release:
        drm_minor_release(minor);
@@ -435,7 +420,6 @@ int drm_lastclose(struct drm_device * dev)
 
        drm_legacy_dma_takedown(dev);
 
-       dev->dev_mapping = NULL;
        mutex_unlock(&dev->struct_mutex);
 
        drm_legacy_dev_reinit(dev);
@@ -551,9 +535,6 @@ int drm_release(struct inode *inode, struct file *filp)
                }
        }
 
-       BUG_ON(dev->dev_mapping == NULL);
-       iput(container_of(dev->dev_mapping, struct inode, i_data));
-
        /* drop the reference held my the file priv */
        if (file_priv->master)
                drm_master_put(&file_priv->master);