linux-kernel - [PATCH] drm/panel: lg-sw43408: Fix an error handling path in sw43408

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Date: Mon, 20 May 2024 11:34:31 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Sumit Semwal <sumit.semwal@...aro.org>,
	Caleb Connolly <caleb.connolly@...aro.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Vinod Koul <vkoul@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Caleb Connolly <caleb@...nolly.tech>,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/panel: lg-sw43408: Fix an error handling path in sw43408_probe()

If mipi_dsi_attach() fails, we must undo the drm_panel_add() call hidden in
sw43408_add(), as already done in the remove function.

Fixes: 069a6c0e94f9 ("drm: panel: Add LG sw43408 panel driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only
---
 drivers/gpu/drm/panel/panel-lg-sw43408.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-lg-sw43408.c b/drivers/gpu/drm/panel/panel-lg-sw43408.c
index 115f4702d59f..27f2ad788d38 100644
--- a/drivers/gpu/drm/panel/panel-lg-sw43408.c
+++ b/drivers/gpu/drm/panel/panel-lg-sw43408.c
@@ -286,7 +286,15 @@ static int sw43408_probe(struct mipi_dsi_device *dsi)
 
 	dsi->dsc = &ctx->dsc;
 
-	return mipi_dsi_attach(dsi);
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0)
+		goto err_remove_panel;
+
+	return 0;
+
+err_remove_panel:
+	drm_panel_remove(&ctx->base);
+	return ret;
 }
 
 static void sw43408_remove(struct mipi_dsi_device *dsi)
-- 
2.45.1