drm/panel: remove return value of function drm_panel_add

The function "int drm_panel_add(struct drm_panel *panel)"
always returns 0, this return value is meaningless.
Also, there is no need to check return value which calls
"drm_panel_add and", error branch code will never run.
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200801120216.8488-1-bernard@vivo.com

drivers/gpu/drm/drm_panel.c

@@ -70,16 +70,12 @@ EXPORT_SYMBOL(drm_panel_init);
  *
  * Add a panel to the global registry so that it can be looked up by display
  * drivers.
- *
- * Return: 0 on success or a negative error code on failure.
  */
-int drm_panel_add(struct drm_panel *panel)
+void drm_panel_add(struct drm_panel *panel)
 {
 	mutex_lock(&panel_lock);
 	list_add_tail(&panel->list, &panel_list);
 	mutex_unlock(&panel_lock);
-
-	return 0;
 }
 EXPORT_SYMBOL(drm_panel_add);
 

drivers/gpu/drm/panel/panel-arm-versatile.c

@@ -349,7 +349,9 @@ static int versatile_panel_probe(struct platform_device *pdev)
 	drm_panel_init(&vpanel->panel, dev, &versatile_panel_drm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&vpanel->panel);
+	drm_panel_add(&vpanel->panel);
+
+	return 0;
 }
 
 static const struct of_device_id versatile_panel_match[] = {

drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c

@@ -315,11 +315,7 @@ static int tm5p5_nt35596_probe(struct mipi_dsi_device *dsi)
 		return ret;
 	}
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0) {
-		dev_err(dev, "Failed to add panel: %d\n", ret);
-		return ret;
-	}
+	drm_panel_add(&ctx->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0) {

drivers/gpu/drm/panel/panel-boe-himax8279d.c

@@ -895,7 +895,9 @@ static int panel_add(struct panel_info *pinfo)
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&pinfo->base);
+	drm_panel_add(&pinfo->base);
+
+	return 0;
 }
 
 static int panel_probe(struct mipi_dsi_device *dsi)

drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c

@@ -787,7 +787,9 @@ static int boe_panel_add(struct boe_panel *boe)
 	boe->base.funcs = &boe_panel_funcs;
 	boe->base.dev = &boe->dsi->dev;
 
-	return drm_panel_add(&boe->base);
+	drm_panel_add(&boe->base);
+
+	return 0;
 }
 
 static int boe_panel_probe(struct mipi_dsi_device *dsi)

drivers/gpu/drm/panel/panel-feixin-k101-im2ba02.c

@@ -477,9 +477,7 @@ static int k101_im2ba02_dsi_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&ctx->panel);
 
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
 	dsi->format = MIPI_DSI_FMT_RGB888;

drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c

@@ -224,9 +224,7 @@ static int feiyang_dsi_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&ctx->panel);
 
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST;
 	dsi->format = MIPI_DSI_FMT_RGB888;

drivers/gpu/drm/panel/panel-ilitek-ili9322.c

@@ -892,7 +892,9 @@ static int ili9322_probe(struct spi_device *spi)
 	drm_panel_init(&ili->panel, dev, &ili9322_drm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&ili->panel);
+	drm_panel_add(&ili->panel);
+
+	return 0;
 }
 
 static int ili9322_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-ilitek-ili9881c.c

@@ -446,9 +446,7 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&ctx->panel);
 
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
 	dsi->format = MIPI_DSI_FMT_RGB888;

drivers/gpu/drm/panel/panel-innolux-p079zca.c

@@ -475,9 +475,7 @@ static int innolux_panel_add(struct mipi_dsi_device *dsi,
 	if (err)
 		return err;
 
-	err = drm_panel_add(&innolux->base);
-	if (err < 0)
-		return err;
+	drm_panel_add(&innolux->base);
 
 	mipi_dsi_set_drvdata(dsi, innolux);
 	innolux->link = dsi;

drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

@@ -440,9 +440,9 @@ static int jdi_panel_add(struct jdi_panel *jdi)
 	drm_panel_init(&jdi->base, &jdi->dsi->dev, &jdi_panel_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
 
-	ret = drm_panel_add(&jdi->base);
+	drm_panel_add(&jdi->base);
 
-	return ret;
+	return 0;
 }
 
 static void jdi_panel_del(struct jdi_panel *jdi)

drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c

@@ -382,7 +382,9 @@ static int kingdisplay_panel_add(struct kingdisplay_panel *kingdisplay)
 	if (err)
 		return err;
 
-	return drm_panel_add(&kingdisplay->base);
+	drm_panel_add(&kingdisplay->base);
+
+	return 0;
 }
 
 static void kingdisplay_panel_del(struct kingdisplay_panel *kingdisplay)

drivers/gpu/drm/panel/panel-lg-lb035q02.c

@@ -198,7 +198,9 @@ static int lb035q02_probe(struct spi_device *spi)
 	drm_panel_init(&lcd->panel, &lcd->spi->dev, &lb035q02_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&lcd->panel);
+	drm_panel_add(&lcd->panel);
+
+	return 0;
 }
 
 static int lb035q02_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-lg-lg4573.c

@@ -261,7 +261,9 @@ static int lg4573_probe(struct spi_device *spi)
 	drm_panel_init(&ctx->panel, &spi->dev, &lg4573_drm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&ctx->panel);
+	drm_panel_add(&ctx->panel);
+
+	return 0;
 }
 
 static int lg4573_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-lvds.c

@@ -227,9 +227,7 @@ static int panel_lvds_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&lvds->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&lvds->panel);
 
 	dev_set_drvdata(lvds->dev, lvds);
 	return 0;

drivers/gpu/drm/panel/panel-nec-nl8048hl11.c

@@ -207,7 +207,9 @@ static int nl8048_probe(struct spi_device *spi)
 	drm_panel_init(&lcd->panel, &lcd->spi->dev, &nl8048_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&lcd->panel);
+	drm_panel_add(&lcd->panel);
+
+	return 0;
 }
 
 static int nl8048_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-novatek-nt35510.c

@@ -956,9 +956,7 @@ static int nt35510_probe(struct mipi_dsi_device *dsi)
 		nt->panel.backlight = bl;
 	}
 
-	ret = drm_panel_add(&nt->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&nt->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0)

drivers/gpu/drm/panel/panel-novatek-nt39016.c

@@ -303,11 +303,7 @@ static int nt39016_probe(struct spi_device *spi)
 	drm_panel_init(&panel->drm_panel, dev, &nt39016_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	err = drm_panel_add(&panel->drm_panel);
-	if (err < 0) {
-		dev_err(dev, "Failed to register panel");
-		return err;
-	}
+	drm_panel_add(&panel->drm_panel);
 
 	return 0;
 }

drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c

@@ -283,7 +283,9 @@ static int lcd_olinuxino_probe(struct i2c_client *client,
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&lcd->panel);
+	drm_panel_add(&lcd->panel);
+
+	return 0;
 }
 
 static int lcd_olinuxino_remove(struct i2c_client *client)

drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c

@@ -164,7 +164,9 @@ static int osd101t2587_panel_add(struct osd101t2587_panel *osd101t2587)
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&osd101t2587->base);
+	drm_panel_add(&osd101t2587->base);
+
+	return 0;
 }
 
 static int osd101t2587_panel_probe(struct mipi_dsi_device *dsi)

drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c

@@ -206,7 +206,9 @@ static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&wuxga_nt->base);
+	drm_panel_add(&wuxga_nt->base);
+
+	return 0;
 }
 
 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)

drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c

@@ -361,7 +361,7 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c,
 	struct rpi_touchscreen *ts;
 	struct device_node *endpoint, *dsi_host_node;
 	struct mipi_dsi_host *host;
-	int ret, ver;
+	int ver;
 	struct mipi_dsi_device_info info = {
 		.type = RPI_DSI_DRIVER_NAME,
 		.channel = 0,
@@ -429,9 +429,7 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c,
 	/* This appears last, as it's what will unblock the DSI host
 	 * driver's component bind function.
 	 */
-	ret = drm_panel_add(&ts->base);
-	if (ret)
-		return ret;
+	drm_panel_add(&ts->base);
 
 	return 0;
 

drivers/gpu/drm/panel/panel-raydium-rm67191.c

@@ -609,9 +609,7 @@ static int rad_panel_probe(struct mipi_dsi_device *dsi)
 		       DRM_MODE_CONNECTOR_DSI);
 	dev_set_drvdata(dev, panel);
 
-	ret = drm_panel_add(&panel->panel);
-	if (ret)
-		return ret;
+	drm_panel_add(&panel->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret)

drivers/gpu/drm/panel/panel-ronbo-rb070d30.c

@@ -200,9 +200,7 @@ static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&ctx->panel);
 
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
 	dsi->format = MIPI_DSI_FMT_RGB888;

drivers/gpu/drm/panel/panel-samsung-ld9040.c

@@ -354,7 +354,9 @@ static int ld9040_probe(struct spi_device *spi)
 	drm_panel_init(&ctx->panel, dev, &ld9040_drm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&ctx->panel);
+	drm_panel_add(&ctx->panel);
+
+	return 0;
 }
 
 static int ld9040_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-samsung-s6d16d0.c

@@ -212,9 +212,7 @@ static int s6d16d0_probe(struct mipi_dsi_device *dsi)
 	drm_panel_init(&s6->panel, dev, &s6d16d0_drm_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
 
-	ret = drm_panel_add(&s6->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&s6->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0)

drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c

@@ -733,9 +733,7 @@ static int s6e3ha2_probe(struct mipi_dsi_device *dsi)
 	drm_panel_init(&ctx->panel, dev, &s6e3ha2_drm_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		goto unregister_backlight;
+	drm_panel_add(&ctx->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0)
@@ -745,8 +743,6 @@ static int s6e3ha2_probe(struct mipi_dsi_device *dsi)
 
 remove_panel:
 	drm_panel_remove(&ctx->panel);
-
-unregister_backlight:
 	backlight_device_unregister(ctx->bl_dev);
 
 	return ret;

drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c

@@ -479,9 +479,7 @@ static int s6e63j0x03_probe(struct mipi_dsi_device *dsi)
 	ctx->bl_dev->props.brightness = DEFAULT_BRIGHTNESS;
 	ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		goto unregister_backlight;
+	drm_panel_add(&ctx->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0)
@@ -491,8 +489,6 @@ static int s6e63j0x03_probe(struct mipi_dsi_device *dsi)
 
 remove_panel:
 	drm_panel_remove(&ctx->panel);
-
-unregister_backlight:
 	backlight_device_unregister(ctx->bl_dev);
 
 	return ret;

drivers/gpu/drm/panel/panel-samsung-s6e63m0.c

@@ -479,7 +479,9 @@ static int s6e63m0_probe(struct spi_device *spi)
 	if (ret < 0)
 		return ret;
 
-	return drm_panel_add(&ctx->panel);
+	drm_panel_add(&ctx->panel);
+
+	return 0;
 }
 
 static int s6e63m0_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c

@@ -242,11 +242,7 @@ static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
 	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0) {
-		dev_err(dev, "Failed to add panel: %d\n", ret);
-		return ret;
-	}
+	drm_panel_add(&ctx->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0) {

drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c

@@ -1020,9 +1020,7 @@ static int s6e8aa0_probe(struct mipi_dsi_device *dsi)
 	drm_panel_init(&ctx->panel, dev, &s6e8aa0_drm_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&ctx->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0)

drivers/gpu/drm/panel/panel-seiko-43wvf1g.c

@@ -258,9 +258,7 @@ static int seiko_panel_probe(struct device *dev,
 	if (err)
 		return err;
 
-	err = drm_panel_add(&panel->base);
-	if (err < 0)
-		return err;
+	drm_panel_add(&panel->base);
 
 	dev_set_drvdata(dev, panel);
 

drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c

@@ -325,7 +325,9 @@ static int sharp_panel_add(struct sharp_panel *sharp)
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&sharp->base);
+	drm_panel_add(&sharp->base);
+
+	return 0;
 }
 
 static void sharp_panel_del(struct sharp_panel *sharp)

drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c

@@ -187,7 +187,9 @@ static int ls037v7dw01_probe(struct platform_device *pdev)
 	drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	return drm_panel_add(&lcd->panel);
+	drm_panel_add(&lcd->panel);
+
+	return 0;
 }
 
 static int ls037v7dw01_remove(struct platform_device *pdev)

drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c

@@ -261,7 +261,9 @@ static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&sharp_nt->base);
+	drm_panel_add(&sharp_nt->base);
+
+	return 0;
 }
 
 static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)

drivers/gpu/drm/panel/panel-simple.c

@@ -613,9 +613,7 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 	if (err)
 		goto free_ddc;
 
-	err = drm_panel_add(&panel->base);
-	if (err < 0)
-		goto free_ddc;
+	drm_panel_add(&panel->base);
 
 	dev_set_drvdata(dev, panel);
 

drivers/gpu/drm/panel/panel-sitronix-st7701.c

@@ -380,9 +380,7 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&st7701->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&st7701->panel);
 
 	mipi_dsi_set_drvdata(dsi, st7701);
 	st7701->dsi = dsi;

drivers/gpu/drm/panel/panel-sitronix-st7789v.c

@@ -382,9 +382,7 @@ static int st7789v_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = drm_panel_add(&ctx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&ctx->panel);
 
 	return 0;
 }

drivers/gpu/drm/panel/panel-sony-acx424akp.c

@@ -504,9 +504,7 @@ static int acx424akp_probe(struct mipi_dsi_device *dsi)
 	acx->bl->props.brightness = 512;
 	acx->bl->props.power = FB_BLANK_POWERDOWN;
 
-	ret = drm_panel_add(&acx->panel);
-	if (ret < 0)
-		return ret;
+	drm_panel_add(&acx->panel);
 
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0) {

drivers/gpu/drm/panel/panel-sony-acx565akm.c

@@ -650,12 +650,7 @@ static int acx565akm_probe(struct spi_device *spi)
 	drm_panel_init(&lcd->panel, &lcd->spi->dev, &acx565akm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	ret = drm_panel_add(&lcd->panel);
-	if (ret < 0) {
-		if (lcd->has_bc)
-			acx565akm_backlight_cleanup(lcd);
-		return ret;
-	}
+	drm_panel_add(&lcd->panel);
 
 	return 0;
 }

drivers/gpu/drm/panel/panel-tpo-td028ttec1.c

@@ -350,7 +350,9 @@ static int td028ttec1_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	return drm_panel_add(&lcd->panel);
+	drm_panel_add(&lcd->panel);
+
+	return 0;
 }
 
 static int td028ttec1_remove(struct spi_device *spi)

drivers/gpu/drm/panel/panel-tpo-td043mtea1.c

@@ -460,11 +460,7 @@ static int td043mtea1_probe(struct spi_device *spi)
 	drm_panel_init(&lcd->panel, &lcd->spi->dev, &td043mtea1_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	ret = drm_panel_add(&lcd->panel);
-	if (ret < 0) {
-		sysfs_remove_group(&spi->dev.kobj, &td043mtea1_attr_group);
-		return ret;
-	}
+	drm_panel_add(&lcd->panel);
 
 	return 0;
 }

drivers/gpu/drm/panel/panel-tpo-tpg110.c

@@ -448,7 +448,9 @@ static int tpg110_probe(struct spi_device *spi)
 
 	spi_set_drvdata(spi, tpg);
 
-	return drm_panel_add(&tpg->panel);
+	drm_panel_add(&tpg->panel);
+
+	return 0;
 }
 
 static int tpg110_remove(struct spi_device *spi)

include/drm/drm_panel.h

@@ -175,7 +175,7 @@ void drm_panel_init(struct drm_panel *panel, struct device *dev,
 		    const struct drm_panel_funcs *funcs,
 		    int connector_type);
 
-int drm_panel_add(struct drm_panel *panel);
+void drm_panel_add(struct drm_panel *panel);
 void drm_panel_remove(struct drm_panel *panel);
 
 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);