[PATCH 22/23] drm/amd/display: Add null check to dc_submit_i2c_oem

[Hamza Mahfooz]

From: Martin Leung <martin.le...@amd.com>

[why]
dc_submit_i2c_oem could be called with ddc null

[how]
add null check and fail the call instead

Acked-by: Alan Liu <haoping....@amd.com>
Signed-off-by: Martin Leung <martin.le...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c 
b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 49339c5c7230..258322c39e9a 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3477,10 +3477,13 @@ bool dc_submit_i2c_oem(
                struct i2c_command *cmd)
 {
        struct ddc_service *ddc = dc->res_pool->oem_device;
-       return dce_i2c_submit_command(
-               dc->res_pool,
-               ddc->ddc_pin,
-               cmd);
+       if (ddc)
+               return dce_i2c_submit_command(
+                       dc->res_pool,
+                       ddc->ddc_pin,
+                       cmd);
+
+       return false;
 }
 
 static bool link_add_remote_sink_helper(struct dc_link *dc_link, struct 
dc_sink *sink)
-- 
2.36.1