[PATCH 1/1] drm/amdgpu: ignore -EPERM error from debugfs

[Nirmoy Das]

Debugfs core APIs will throw -EPERM when user disables debugfs
using CONFIG_DEBUG_FS_ALLOW_NONE or with kernel param. We shouldn't
see that as an error. Also validate drm root dentry before creating
amdgpu debugfs files.

Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 6611b3c7c149..d786072e918b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1617,6 +1617,16 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
 	struct dentry *ent;
 	int r, i;
 
+	if (IS_ERR(root)) {
+		/* When debugfs is disabled we get -EPERM which is not an
+		 * error as this is user controllable.
+		 */
+		if (PTR_ERR(root) == -EPERM)
+			return 0;
+
+		return PTR_ERR(ent);
+	}
+
 	ent = debugfs_create_file("amdgpu_preempt_ib", 0600, root, adev,
 				  &fops_ib_preempt);
 	if (IS_ERR(ent)) {
-- 
2.32.0