[PATCH 4.16 195/279] drm/omap: check return value from soc_device_match

From: Greg Kroah-Hartman
Date: Mon Jun 18 2018 - 04:24:35 EST


4.16-stable review patch. If anyone has any objections, please let me know.

------------------

From: Tomi Valkeinen <tomi.valkeinen@xxxxxx>

[ Upstream commit 4d6cb5e2fee52af17001e92950f0894304706ee4 ]

soc_device_match() can return NULL, so add a check and fail if
soc_device_match() fails.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502091159.7071-2-tomi.valkeinen@xxxxxx
Reviewed-by: Benoit Parrot <bparrot@xxxxxx>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/omapdrm/dss/hdmi4_core.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
@@ -922,8 +922,13 @@ int hdmi4_core_init(struct platform_devi
{
const struct hdmi4_features *features;
struct resource *res;
+ const struct soc_device_attribute *soc;

- features = soc_device_match(hdmi4_soc_devices)->data;
+ soc = soc_device_match(hdmi4_soc_devices);
+ if (!soc)
+ return -ENODEV;
+
+ features = soc->data;
core->cts_swmode = features->cts_swmode;
core->audio_use_mclk = features->audio_use_mclk;