[PATCH] drm/panel: remove return value of function drm_panel_add

From: Bernard Zhao
Date: Sat Aug 01 2020 - 08:02:45 EST

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@xxxxxxxx>
---
drivers/gpu/drm/drm_panel.c | 4 +---
drivers/gpu/drm/panel/panel-arm-versatile.c | 4 +++-
drivers/gpu/drm/panel/panel-boe-himax8279d.c | 4 +++-
drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 4 +++-
drivers/gpu/drm/panel/panel-feixin-k101-im2ba02.c | 4 +---
drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c | 4 +---
drivers/gpu/drm/panel/panel-ilitek-ili9322.c | 4 +++-
drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 4 +---
drivers/gpu/drm/panel/panel-innolux-p079zca.c | 4 +---
drivers/gpu/drm/panel/panel-jdi-lt070me05000.c | 4 ++--
drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c | 4 +++-
drivers/gpu/drm/panel/panel-lg-lb035q02.c | 4 +++-
drivers/gpu/drm/panel/panel-lg-lg4573.c | 4 +++-
drivers/gpu/drm/panel/panel-lvds.c | 4 +---
drivers/gpu/drm/panel/panel-nec-nl8048hl11.c | 4 +++-
drivers/gpu/drm/panel/panel-novatek-nt35510.c | 4 +---
drivers/gpu/drm/panel/panel-novatek-nt39016.c | 6 +-----
drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c | 4 +++-
drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c | 4 +++-
drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c | 4 +++-
drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 4 +---
drivers/gpu/drm/panel/panel-raydium-rm67191.c | 4 +---
drivers/gpu/drm/panel/panel-ronbo-rb070d30.c | 4 +---
drivers/gpu/drm/panel/panel-samsung-ld9040.c | 4 +++-
drivers/gpu/drm/panel/panel-samsung-s6d16d0.c | 4 +---
drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c | 4 +---
drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c | 4 +---
drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 4 +++-
drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c | 6 +-----
drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c | 4 +---
drivers/gpu/drm/panel/panel-seiko-43wvf1g.c | 4 +---
drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c | 4 +++-
drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c | 4 +++-
drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c | 4 +++-
drivers/gpu/drm/panel/panel-simple.c | 4 +---
drivers/gpu/drm/panel/panel-sitronix-st7701.c | 4 +---
drivers/gpu/drm/panel/panel-sitronix-st7789v.c | 4 +---
drivers/gpu/drm/panel/panel-sony-acx424akp.c | 4 +---
drivers/gpu/drm/panel/panel-sony-acx565akm.c | 7 +------
drivers/gpu/drm/panel/panel-tpo-td028ttec1.c | 4 +++-
drivers/gpu/drm/panel/panel-tpo-td043mtea1.c | 6 +-----
drivers/gpu/drm/panel/panel-tpo-tpg110.c | 4 +++-
include/drm/drm_panel.h | 2 +-
43 files changed, 80 insertions(+), 99 deletions(-)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 8c7bac85a793..fab41f63ad12 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -73,13 +73,11 @@ EXPORT_SYMBOL(drm_panel_init);
*
* 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);

diff --git a/drivers/gpu/drm/panel/panel-arm-versatile.c b/drivers/gpu/drm/panel/panel-arm-versatile.c
index 41444a73c980..5aaee5414c40 100644
--- a/drivers/gpu/drm/panel/panel-arm-versatile.c
+++ b/drivers/gpu/drm/panel/panel-arm-versatile.c
@@ -353,7 +353,9 @@ 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[] = {
diff --git a/drivers/gpu/drm/panel/panel-boe-himax8279d.c b/drivers/gpu/drm/panel/panel-boe-himax8279d.c
index 74d58ee7d04c..e0630ce04147 100644
--- a/drivers/gpu/drm/panel/panel-boe-himax8279d.c
+++ b/drivers/gpu/drm/panel/panel-boe-himax8279d.c
@@ -896,7 +896,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
index 2649469070aa..b9379ad92546 100644
--- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
@@ -792,7 +792,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-feixin-k101-im2ba02.c b/drivers/gpu/drm/panel/panel-feixin-k101-im2ba02.c
index fddbfddf6566..7f2eb54e4254 100644
--- a/drivers/gpu/drm/panel/panel-feixin-k101-im2ba02.c
+++ b/drivers/gpu/drm/panel/panel-feixin-k101-im2ba02.c
@@ -478,9 +478,7 @@ 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;
diff --git a/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
index 95b789ab9d29..2c168a405928 100644
--- a/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
+++ b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
@@ -225,9 +225,7 @@ 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;
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9322.c b/drivers/gpu/drm/panel/panel-ilitek-ili9322.c
index 873b1c7059bd..4a41d8734cc7 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9322.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9322.c
@@ -899,7 +899,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index f54077c216a3..52fd6f3d4452 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -447,9 +447,7 @@ 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;
diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
index 7419f1f0acee..cc3e07b61a6c 100644
--- a/drivers/gpu/drm/panel/panel-innolux-p079zca.c
+++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
@@ -477,9 +477,7 @@ 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;
diff --git a/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
index 4bfd8c877c8e..4fc2185575a7 100644
--- a/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
+++ b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
@@ -441,9 +441,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c b/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
index bac1a2a06c92..c75790f95461 100644
--- a/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
+++ b/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
@@ -383,7 +383,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-lg-lb035q02.c b/drivers/gpu/drm/panel/panel-lg-lb035q02.c
index e90efeaba4ad..8cb403ed2d5f 100644
--- a/drivers/gpu/drm/panel/panel-lg-lb035q02.c
+++ b/drivers/gpu/drm/panel/panel-lg-lb035q02.c
@@ -199,7 +199,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-lg-lg4573.c b/drivers/gpu/drm/panel/panel-lg-lg4573.c
index 5907f2503755..02e8e593ba17 100644
--- a/drivers/gpu/drm/panel/panel-lg-lg4573.c
+++ b/drivers/gpu/drm/panel/panel-lg-lg4573.c
@@ -262,7 +262,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
index 5ce3f4a2b7a1..41305c3dcf31 100644
--- a/drivers/gpu/drm/panel/panel-lvds.c
+++ b/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;
diff --git a/drivers/gpu/drm/panel/panel-nec-nl8048hl11.c b/drivers/gpu/drm/panel/panel-nec-nl8048hl11.c
index c4f83f6384e1..8217cb9a0658 100644
--- a/drivers/gpu/drm/panel/panel-nec-nl8048hl11.c
+++ b/drivers/gpu/drm/panel/panel-nec-nl8048hl11.c
@@ -208,7 +208,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35510.c b/drivers/gpu/drm/panel/panel-novatek-nt35510.c
index 4a8fa908a2cf..9a701a30fe04 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35510.c
+++ b/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)
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt39016.c b/drivers/gpu/drm/panel/panel-novatek-nt39016.c
index 05cae8d62d56..9957b846bcff 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt39016.c
+++ b/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;
}
diff --git a/drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c b/drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c
index 09deb99981a4..2edda548fffd 100644
--- a/drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c
+++ b/drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c
@@ -284,7 +284,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c b/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
index 3a0229d60095..4fbf12ee858e 100644
--- a/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
+++ b/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
@@ -165,7 +165,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c b/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
index 69693451462e..368722d98faf 100644
--- a/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
+++ b/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
@@ -207,7 +207,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
index 8f078b7dd89e..25112e5b353b 100644
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
@@ -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;

diff --git a/drivers/gpu/drm/panel/panel-raydium-rm67191.c b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
index 313637d53d28..055201534bf5 100644
--- a/drivers/gpu/drm/panel/panel-raydium-rm67191.c
+++ b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
@@ -610,9 +610,7 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c b/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
index ef18559e237e..6298051c7244 100644
--- a/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
+++ b/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
@@ -201,9 +201,7 @@ 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;
diff --git a/drivers/gpu/drm/panel/panel-samsung-ld9040.c b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
index 9bb2e8c7934a..358168ed8355 100644
--- a/drivers/gpu/drm/panel/panel-samsung-ld9040.c
+++ b/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)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c b/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
index 2150043dcf6b..72c26a63dbe5 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
@@ -218,9 +218,7 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c b/drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c
index 36ebd5a4ac7b..d242b2f5f2d8 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c
@@ -735,9 +735,7 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
index a3570e0a90a8..0c60f61015ff 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
@@ -480,9 +480,7 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
index a5f76eb4fa25..40f2f427dc91 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
@@ -480,7 +480,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
index 9d843fcc3a22..e17ba1d84481 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
@@ -243,11 +243,7 @@ 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) {
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c b/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c
index 8a028d2bd0d6..e36cb1a25318 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c
+++ b/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)
diff --git a/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c b/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c
index 40fcbbbacb2c..46428b513a5d 100644
--- a/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c
+++ b/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c
@@ -257,9 +257,7 @@ 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);

diff --git a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
index b5d1977221a7..9727d3748034 100644
--- a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
@@ -326,7 +326,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
index 1cf3f02435c1..be5cdadf5147 100644
--- a/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
@@ -188,7 +188,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
index ce586c6d70c7..730efc3d6984 100644
--- a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
@@ -262,7 +262,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 4aeb960ccf15..b290b2b966c2 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -555,9 +555,7 @@ 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);

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7701.c b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
index 4b4f2558e3b4..66030978bcf9 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
+++ b/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;
diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
index cc02c54c1b2e..6ed8c9823ee6 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
@@ -383,9 +383,7 @@ 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;
}
diff --git a/drivers/gpu/drm/panel/panel-sony-acx424akp.c b/drivers/gpu/drm/panel/panel-sony-acx424akp.c
index c91e55b2d7a3..4c46ed9b3f6d 100644
--- a/drivers/gpu/drm/panel/panel-sony-acx424akp.c
+++ b/drivers/gpu/drm/panel/panel-sony-acx424akp.c
@@ -506,9 +506,7 @@ 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) {
diff --git a/drivers/gpu/drm/panel/panel-sony-acx565akm.c b/drivers/gpu/drm/panel/panel-sony-acx565akm.c
index 5c4b6f6e5c2d..08442104dc43 100644
--- a/drivers/gpu/drm/panel/panel-sony-acx565akm.c
+++ b/drivers/gpu/drm/panel/panel-sony-acx565akm.c
@@ -651,12 +651,7 @@ 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;
}
diff --git a/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c b/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
index aeca15dfeb3c..5f4001a21a04 100644
--- a/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
+++ b/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
@@ -351,7 +351,9 @@ 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)
diff --git a/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c b/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
index 75f1f1f1b6de..1d7a0df1680e 100644
--- a/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
+++ b/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
@@ -461,11 +461,7 @@ 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;
}
diff --git a/drivers/gpu/drm/panel/panel-tpo-tpg110.c b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
index 8472d018c16f..b54dfcc5b3ef 100644
--- a/drivers/gpu/drm/panel/panel-tpo-tpg110.c
+++ b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
@@ -453,7 +453,9 @@ 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)
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 6193cb555acc..ff066524cb70 100644
--- a/include/drm/drm_panel.h
+++ b/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);
--
2.17.1