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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-09-11 13:49:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 16:51:20 +0300 |
| commit | 888482cb8da0ae18e9e6af328be431e0bc76a95d (patch) | |
| tree | f08c1f56b401219937af68cd157cf2891e88391a /drivers/gpu/drm | |
| parent | 97a5c6b7ff2577042299b9db218899b8e22916d1 (diff) | |
| download | linux-888482cb8da0ae18e9e6af328be431e0bc76a95d.tar.xz | |
drm: panel-lvds: Potential Oops in probe error handling
[ Upstream commit fb2ee9bf084bcaeff1e5be100decc0eacb4af2d5 ]
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: 7c9dff5bd643 ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-lvds.c | 21 |
1 files changed, 4 insertions, 17 deletions
diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c index 8a1687887ae9..bd704a36c5d0 100644 --- a/drivers/gpu/drm/panel/panel-lvds.c +++ b/drivers/gpu/drm/panel/panel-lvds.c @@ -199,7 +199,6 @@ 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); @@ -245,14 +244,9 @@ 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 @@ -268,14 +262,10 @@ 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) @@ -286,9 +276,6 @@ static int panel_lvds_remove(struct platform_device *pdev) panel_lvds_disable(&lvds->panel); - if (lvds->backlight) - put_device(&lvds->backlight->dev); - return 0; } |