drm/omap: check return value from soc_device_match

[ 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@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502091159.7071-2-tomi.valkeinen@ti.com
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
index c3453f3bd603f49d95ac11423185753870aa887f..1359bf50598f4d0ae79c81734bb149825655394a 100644 (file)
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
@@ -926,8 +926,13 @@ int hdmi4_core_init(struct platform_device *pdev, struct hdmi_core_data *core)
 {
        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;