drm: proc: Use minor->index to label things, not PDE->name

Use minor->index to label things, not the name field from the proc_dir_entry
of the /proc/dwm/<minor>/ directory.

Also, use "%u" not "%d" to render the value and use a 12-byte buffer in which
to render the integer, not a 16-byte buffer.  The longest string an unsigned
int can give you is 10 chars (4294967295) plus a NUL, so round up to 12 as the
stack is likely to be 4- or 8-byte aligned.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: dri-devel@lists.freedesktop.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/gpu/drm/drm_proc.c

@@ -116,14 +116,13 @@ static int drm_proc_create_files(const struct drm_info_list *files, int count,
 		ent = proc_create_data(files[i].name, S_IRUGO, root,
 				       &drm_proc_fops, tmp);
 		if (!ent) {
-			DRM_ERROR("Cannot create /proc/dri/%s/%s\n",
+			DRM_ERROR("Cannot create /proc/dri/%u/%s\n",
-				  root->name, files[i].name);
+				  minor->index, files[i].name);
 			list_del(&tmp->list);
 			kfree(tmp);
 			ret = -1;
 			goto fail;
 		}
-
 	}
 	return 0;
 
@@ -137,7 +136,6 @@ fail:
  * Initialize the DRI proc filesystem for a device
  *
  * \param dev DRM device
- * \param minor device minor number
  * \param root DRI proc dir entry.
  * \param dev_root resulting DRI device proc dir entry.
  * \return root entry pointer on success, or NULL on failure.
@@ -146,14 +144,13 @@ fail:
  * "/proc/dri/%minor%/", and each entry in proc_list as
  * "/proc/dri/%minor%/%name%".
  */
-int drm_proc_init(struct drm_minor *minor, int minor_id,
+int drm_proc_init(struct drm_minor *minor, struct proc_dir_entry *root)
-		  struct proc_dir_entry *root)
 {
-	char name[64];
+	char name[12];
 	int ret;
 
 	INIT_LIST_HEAD(&minor->proc_nodes.list);
-	sprintf(name, "%d", minor_id);
+	sprintf(name, "%u", minor->index);
 	minor->proc_root = proc_mkdir(name, root);
 	if (!minor->proc_root) {
 		DRM_ERROR("Cannot create /proc/dri/%s\n", name);

drivers/gpu/drm/drm_stub.c

@@ -352,7 +352,7 @@ int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 	idr_replace(&drm_minors_idr, new_minor, minor_id);
 
 	if (type == DRM_MINOR_LEGACY) {
-		ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
+		ret = drm_proc_init(new_minor, drm_proc_root);
 		if (ret) {
 			DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
 			goto err_mem;

include/drm/drmP.h

@@ -1546,8 +1546,7 @@ extern struct idr drm_minors_idr;
 extern struct drm_local_map *drm_getsarea(struct drm_device *dev);
 
 				/* Proc support (drm_proc.h) */
-extern int drm_proc_init(struct drm_minor *minor, int minor_id,
+extern int drm_proc_init(struct drm_minor *minor, struct proc_dir_entry *root);
-			 struct proc_dir_entry *root);
 extern int drm_proc_cleanup(struct drm_minor *minor, struct proc_dir_entry *root);
 
 				/* Debugfs support */