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drm: panel-lvds: Potential Oops in probe error handling

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The "lvds->backlight" pointer could be NULL in situations where
of_parse_phandle() returns NULL.  This code is cleaner if we use the
managed devm_of_find_backlight() so the clean up is automatic.

Fixes: 7c9dff5bd6 ("drm: panels: Add LVDS panel driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190911104928.GA15930@mwanda
This commit is contained in:
Dan Carpenter 2019-09-11 13:49:28 +03:00 committed by Sam Ravnborg
parent 21185a6687
commit fb2ee9bf08
1 changed files with 4 additions and 17 deletions
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21
drivers/gpu/drm/panel/panel-lvds.c
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@ -197,7 +197,6 @@ static int panel_lvds_parse_dt(struct panel_lvds *lvds)
static int panel_lvds_probe(struct platform_device *pdev)
{
struct panel_lvds *lvds;
struct device_node *np;
int ret;
lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
@ -243,14 +242,9 @@ static int panel_lvds_probe(struct platform_device *pdev)
return ret;
}
np = of_parse_phandle(lvds->dev->of_node, "backlight", 0);
if (np) {
lvds->backlight = of_find_backlight_by_node(np);
of_node_put(np);
if (!lvds->backlight)
return -EPROBE_DEFER;
}
lvds->backlight = devm_of_find_backlight(lvds->dev);
if (IS_ERR(lvds->backlight))
return PTR_ERR(lvds->backlight);
/*
* TODO: Handle all power supplies specified in the DT node in a generic
@ -265,14 +259,10 @@ static int panel_lvds_probe(struct platform_device *pdev)
ret = drm_panel_add(&lvds->panel);
if (ret < 0)
goto error;
return ret;
dev_set_drvdata(lvds->dev, lvds);
return 0;
error:
put_device(&lvds->backlight->dev);
return ret;
}
static int panel_lvds_remove(struct platform_device *pdev)
@ -283,9 +273,6 @@ static int panel_lvds_remove(struct platform_device *pdev)
panel_lvds_disable(&lvds->panel);
if (lvds->backlight)
put_device(&lvds->backlight->dev);
return 0;
}