msm: dpu1: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
Cc: Jordan Crouse <jcrouse@codeaurora.org>
Cc: Abhinav Kumar <abhinavk@codeaurora.org>
Cc: Bruce Wang <bzwang@chromium.org>
Cc: Sravanthi Kollukuduru <skolluku@codeaurora.org>
Cc: Fritz Koenig <frkoenig@google.com>
Cc: Chandan Uddaraju <chandanu@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

@@ -506,8 +506,6 @@ int dpu_core_perf_debugfs_init(struct dpu_kms *dpu_kms, struct dentry *parent)
 	struct dentry *entry;
 
 	entry = debugfs_create_dir("core_perf", parent);
-	if (IS_ERR_OR_NULL(entry))
-		return -EINVAL;
 
 	debugfs_create_u64("max_core_clk_rate", 0600, entry,
 			&perf->max_core_clk_rate);

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -1266,10 +1266,7 @@ static int _dpu_crtc_init_debugfs(struct drm_crtc *crtc)
 
 	dpu_crtc->debugfs_root = debugfs_create_dir(dpu_crtc->name,
 			crtc->dev->primary->debugfs_root);
-	if (!dpu_crtc->debugfs_root)
-		return -ENOMEM;
 
-	/* don't error check these */
 	debugfs_create_file("status", 0400,
 			dpu_crtc->debugfs_root,
 			dpu_crtc, &debugfs_status_fops);

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -1985,8 +1985,6 @@ static int _dpu_encoder_init_debugfs(struct drm_encoder *drm_enc)
 	/* create overall sub-directory for the encoder */
 	dpu_enc->debugfs_root = debugfs_create_dir(name,
 			drm_enc->dev->primary->debugfs_root);
-	if (!dpu_enc->debugfs_root)
-		return -ENOMEM;
 
 	/* don't error check these */
 	debugfs_create_file("status", 0600,

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -142,8 +142,6 @@ static void dpu_debugfs_danger_init(struct dpu_kms *dpu_kms,
 		struct dentry *parent)
 {
 	struct dentry *entry = debugfs_create_dir("danger", parent);
-	if (IS_ERR_OR_NULL(entry))
-		return;
 
 	debugfs_create_file("danger_status", 0600, entry,
 			dpu_kms, &dpu_debugfs_danger_stats_fops);
@@ -218,17 +216,16 @@ void dpu_debugfs_setup_regset32(struct dpu_debugfs_regset32 *regset,
 	}
 }
 
-void *dpu_debugfs_create_regset32(const char *name, umode_t mode,
+void dpu_debugfs_create_regset32(const char *name, umode_t mode,
 		void *parent, struct dpu_debugfs_regset32 *regset)
 {
 	if (!name || !regset || !regset->dpu_kms || !regset->blk_len)
-		return NULL;
+		return;
 
 	/* make sure offset is a multiple of 4 */
 	regset->offset = round_down(regset->offset, 4);
 
-	return debugfs_create_file(name, mode, parent,
-			regset, &dpu_fops_regset32);
+	debugfs_create_file(name, mode, parent, regset, &dpu_fops_regset32);
 }
 
 static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor)
@@ -241,8 +238,6 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor)
 		return -EINVAL;
 
 	entry = debugfs_create_dir("debug", minor->debugfs_root);
-	if (IS_ERR_OR_NULL(entry))
-		return -ENODEV;
 
 	debugfs_create_x32(DPU_DEBUGFS_HWMASKNAME, 0600, entry, p);
 

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h

@@ -197,12 +197,8 @@ void dpu_debugfs_setup_regset32(struct dpu_debugfs_regset32 *regset,
  * @mode:   File mode within debugfs
  * @parent: Parent directory entry within debugfs, can be NULL
  * @regset: Pointer to persistent register block definition
- *
- * Return: dentry pointer for newly created file, use either debugfs_remove()
- *         or debugfs_remove_recursive() (on a parent directory) to remove the
- *         file
  */
-void *dpu_debugfs_create_regset32(const char *name, umode_t mode,
+void dpu_debugfs_create_regset32(const char *name, umode_t mode,
 		void *parent, struct dpu_debugfs_regset32 *regset);
 
 /**

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

@@ -1329,9 +1329,6 @@ static int _dpu_plane_init_debugfs(struct drm_plane *plane)
 		debugfs_create_dir(pdpu->pipe_name,
 				plane->dev->primary->debugfs_root);
 
-	if (!pdpu->debugfs_root)
-		return -ENOMEM;
-
 	/* don't error check these */
 	debugfs_create_x32("features", 0600,
 			pdpu->debugfs_root, &pdpu->features);

drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c

@@ -318,8 +318,6 @@ void dpu_debugfs_vbif_init(struct dpu_kms *dpu_kms, struct dentry *debugfs_root)
 	int i, j;
 
 	entry = debugfs_create_dir("vbif", debugfs_root);
-	if (IS_ERR_OR_NULL(entry))
-		return;
 
 	for (i = 0; i < dpu_kms->catalog->vbif_count; i++) {
 		struct dpu_vbif_cfg *vbif = &dpu_kms->catalog->vbif[i];
@@ -327,8 +325,6 @@ void dpu_debugfs_vbif_init(struct dpu_kms *dpu_kms, struct dentry *debugfs_root)
 		snprintf(vbif_name, sizeof(vbif_name), "%d", vbif->id);
 
 		debugfs_vbif = debugfs_create_dir(vbif_name, entry);
-		if (IS_ERR_OR_NULL(debugfs_vbif))
-			continue;
 
 		debugfs_create_u32("features", 0600, debugfs_vbif,
 			(u32 *)&vbif->features);