linux-kernel - [PATCH 1/3] drm/panel: kingdisplay-kd097d04: Delete panel on attach() failure

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Date:   Thu, 23 Sep 2021 17:33:53 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Heiko Stuebner <heiko@...ech.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH 1/3] drm/panel: kingdisplay-kd097d04: Delete panel on attach() failure

If we fail to attach (e.g., because 1 of 2 dual-DSI controllers aren't
ready), we leave a dangling drm_panel reference to freed memory. Clean
that up on failure.

Fixes: 2a994cbed6b2 ("drm/panel: Add Kingdisplay KD097D04 panel driver")
Signed-off-by: Brian Norris <briannorris@...omium.org>
---

 drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c b/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
index 86e4213e8bb1..daccb1fd5fda 100644
--- a/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
+++ b/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
@@ -406,7 +406,13 @@ static int kingdisplay_panel_probe(struct mipi_dsi_device *dsi)
 	if (err < 0)
 		return err;
 
-	return mipi_dsi_attach(dsi);
+	err = mipi_dsi_attach(dsi);
+	if (err < 0) {
+		kingdisplay_panel_del(kingdisplay);
+		return err;
+	}
+
+	return 0;
 }
 
 static int kingdisplay_panel_remove(struct mipi_dsi_device *dsi)
-- 
2.33.0.685.g46640cef36-goog