This is a note to let you know that I've just added the patch titled drm/bridge: anx7625: Zero error variable when panel bridge not present to the 5.19-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-bridge-anx7625-zero-error-variable-when-panel-br.patch and it can be found in the queue-5.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit e2742e2a5bf765f0168f772b8d31497f19679ca1 Author: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx> Date: Mon Jun 13 12:37:05 2022 -0400 drm/bridge: anx7625: Zero error variable when panel bridge not present [ Upstream commit 3f49f7591e7150c502aa8d04354941ec2394153f ] While parsing the DT, the anx7625 driver checks for the presence of a panel bridge on endpoint 1. If it is missing, pdata->panel_bridge stores the error pointer and the function returns successfully without first cleaning that variable. This is an issue since other functions later check for the presence of a panel bridge by testing the trueness of that variable. In order to ensure proper behavior, zero out pdata->panel_bridge before returning when no panel bridge is found. Fixes: 9e82ea0fb1df ("drm/bridge: anx7625: switch to devm_drm_of_get_bridge") Signed-off-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Signed-off-by: Robert Foss <robert.foss@xxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20220613163705.1531721-1-nfraprado@xxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 01f46d9189c1..0117fd8c62ae 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -1657,8 +1657,10 @@ static int anx7625_parse_dt(struct device *dev, pdata->panel_bridge = devm_drm_of_get_bridge(dev, np, 1, 0); if (IS_ERR(pdata->panel_bridge)) { - if (PTR_ERR(pdata->panel_bridge) == -ENODEV) + if (PTR_ERR(pdata->panel_bridge) == -ENODEV) { + pdata->panel_bridge = NULL; return 0; + } return PTR_ERR(pdata->panel_bridge); }