linux-kernel - [PATCH] drm: of: always initialize panel in drm_of_find_panel_or

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Date:   Mon, 25 Sep 2017 13:30:38 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Daniel Vetter <daniel.vetter@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] drm: of: always initialize panel in
 drm_of_find_panel_or_bridge()

The callers expect "panel" to be initialized, but that isn't true if we
return -ENODEV.  It causes bugs like:

    drivers/gpu/drm/tve200/tve200_drv.c:83 tve200_modeset_init()
    error: uninitialized symbol 'panel'.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 8dafbdfcd2ea..4c191c050e7d 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -233,6 +233,8 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
 
 	if (!panel && !bridge)
 		return -EINVAL;
+	if (panel)
+		*panel = NULL;
 
 	remote = of_graph_get_remote_node(np, port, endpoint);
 	if (!remote)