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

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

From: Tomi Valkeinen <tomi.valkei...@ti.com>

[ 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.valkei...@ti.com>
Link: 
https://patchwork.freedesktop.org/patch/msgid/20180502091159.7071-2-tomi.valkei...@ti.com
Reviewed-by: Benoit Parrot <bpar...@ti.com>
Reviewed-by: Peter Ujfalusi <peter.ujfal...@ti.com>
Signed-off-by: Sean Paul <seanp...@chromium.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 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
@@ -926,8 +926,13 @@ 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;
 


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