[PATCH 2/4] drm/ttm: do not set NULL to debugfs dentry

[Nirmoy Das <nirmoy.das@amd.com>]

For debugfs directory, it is recommended to save the result
and pass over to next debugfs API for creating debugfs
files/directories. Error conditions are handled by debugfs APIs.

CC: Christian Koenig <christian.koenig@amd.com>
CC: Huang Rui <ray.huang@amd.com>
CC: David Airlie <airlied@linux.ie>
CC: Daniel Vetter <daniel@ffwll.ch>

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/ttm/ttm_device.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index be24bb6cefd0..2c66f06198e9 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -44,6 +44,7 @@ static unsigned ttm_glob_use_count;
 struct ttm_global ttm_glob;
 EXPORT_SYMBOL(ttm_glob);
 
+/* Do not deference this pointer as it will contain ERR_PTR on error. */
 struct dentry *ttm_debugfs_root;
 
 static void ttm_global_release(void)
@@ -77,9 +78,6 @@ static int ttm_global_init(void)
 	si_meminfo(&si);
 
 	ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
-	if (IS_ERR(ttm_debugfs_root)) {
-		ttm_debugfs_root = NULL;
-	}
 
 	/* Limit the number of pages in the pool to about 50% of the total
 	 * system memory.
@@ -108,8 +106,7 @@ static int ttm_global_init(void)
 	debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
 				&glob->bo_count);
 out:
-	if (ret && ttm_debugfs_root)
-		debugfs_remove(ttm_debugfs_root);
+	debugfs_remove(ttm_debugfs_root);
 	if (ret)
 		--ttm_glob_use_count;
 	mutex_unlock(&ttm_global_mutex);
-- 
2.32.0