This is a note to let you know that I've just added the patch titled
drm/panel: novatek-nt35950: Improve error handling
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-panel-novatek-nt35950-improve-error-handling.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f12a1431e78b473125d3648613da080fe8e95d6e
Author: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Date: Sat Apr 15 13:00:30 2023 +0200
drm/panel: novatek-nt35950: Improve error handling
[ Upstream commit 5dd45b66742a1f3cfa9a92dc0ac8714c7708ee6c ]
In a very peculiar case when probing and registering with the secondary
DSI host succeeds, but the OF backlight or DSI attachment fails, the
primary DSI device is automatically cleaned up, but the secondary one
is not, leading to -EEXIST when the driver core tries to handle
-EPROBE_DEFER.
Unregister the DSI1 device manually on failure to prevent that.
Fixes: 623a3531e9cf ("drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels")
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230415-konrad-longbois-next-v1-1-ce695dc9df84@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
index abf752b36a523..7498fc6258bb0 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35950.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -585,8 +585,11 @@ static int nt35950_probe(struct mipi_dsi_device *dsi)
DRM_MODE_CONNECTOR_DSI);
ret = drm_panel_of_backlight(&nt->panel);
- if (ret)
+ if (ret) {
+ mipi_dsi_device_unregister(nt->dsi[1]);
+
return dev_err_probe(dev, ret, "Failed to get backlight\n");
+ }
drm_panel_add(&nt->panel);
@@ -602,6 +605,9 @@ static int nt35950_probe(struct mipi_dsi_device *dsi)
ret = mipi_dsi_attach(nt->dsi[i]);
if (ret < 0) {
+ /* If we fail to attach to either host, we're done */
+ mipi_dsi_device_unregister(nt->dsi[1]);
+
return dev_err_probe(dev, ret,
"Cannot attach to DSI%d host.\n", i);
}
