Currently the error checking logic in the dp_debug module could pass zero to PTR_ERR and it causes the below kbot warnings:
drivers/gpu/drm/msm/dp/dp_debug.c:378 dp_debug_init() warn: passing zero to 'PTR_ERR' drivers/gpu/drm/msm/dp/dp_debug.c:387 dp_debug_init() warn: passing zero to 'PTR_ERR' drivers/gpu/drm/msm/dp/dp_debug.c:396 dp_debug_init() warn: passing zero to 'PTR_ERR' drivers/gpu/drm/msm/dp/dp_debug.c:405 dp_debug_init() warn: passing zero to 'PTR_ERR'
Debugfs functions are not supposed to be checked in the normal case so delete this code. Also it silences the above Smatch warnings that we're checking for NULL when these functions only return error pointers.
Reported-by: kernel test robot lkp@intel.com Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Abhinav Kumar abhinavk@codeaurora.org --- drivers/gpu/drm/msm/dp/dp_debug.c | 31 ++++--------------------------- 1 file changed, 4 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c index 6c6998f..2f6247e 100644 --- a/drivers/gpu/drm/msm/dp/dp_debug.c +++ b/drivers/gpu/drm/msm/dp/dp_debug.c @@ -368,44 +368,21 @@ static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor) int rc = 0; struct dp_debug_private *debug = container_of(dp_debug, struct dp_debug_private, dp_debug); - struct dentry *file; - struct dentry *test_active; - struct dentry *test_data, *test_type;
- file = debugfs_create_file("dp_debug", 0444, minor->debugfs_root, + debugfs_create_file("dp_debug", 0444, minor->debugfs_root, debug, &dp_debug_fops); - if (IS_ERR_OR_NULL(file)) { - rc = PTR_ERR(file); - DRM_ERROR("[%s] debugfs create file failed, rc=%d\n", - DEBUG_NAME, rc); - }
- test_active = debugfs_create_file("msm_dp_test_active", 0444, + debugfs_create_file("msm_dp_test_active", 0444, minor->debugfs_root, debug, &test_active_fops); - if (IS_ERR_OR_NULL(test_active)) { - rc = PTR_ERR(test_active); - DRM_ERROR("[%s] debugfs test_active failed, rc=%d\n", - DEBUG_NAME, rc); - }
- test_data = debugfs_create_file("msm_dp_test_data", 0444, + debugfs_create_file("msm_dp_test_data", 0444, minor->debugfs_root, debug, &dp_test_data_fops); - if (IS_ERR_OR_NULL(test_data)) { - rc = PTR_ERR(test_data); - DRM_ERROR("[%s] debugfs test_data failed, rc=%d\n", - DEBUG_NAME, rc); - }
- test_type = debugfs_create_file("msm_dp_test_type", 0444, + debugfs_create_file("msm_dp_test_type", 0444, minor->debugfs_root, debug, &dp_test_type_fops); - if (IS_ERR_OR_NULL(test_type)) { - rc = PTR_ERR(test_type); - DRM_ERROR("[%s] debugfs test_type failed, rc=%d\n", - DEBUG_NAME, rc); - }
debug->root = minor->debugfs_root;