[PATCH 14/36] drm/amd/display: Add null checker before passing variables

[Hamza Mahfooz]

From: Alex Hung <alex.h...@amd.com>

Checks null pointer before passing variables to functions.

This fixes 3 NULL_RETURNS issues reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahf...@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 4de50b297035..48a9243ada7d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2875,7 +2875,8 @@ static int dm_suspend(void *handle)
 
                dm->cached_dc_state = 
dc_state_create_copy(dm->dc->current_state);
 
-               dm_gpureset_toggle_interrupts(adev, dm->cached_dc_state, false);
+               if (dm->cached_dc_state)
+                       dm_gpureset_toggle_interrupts(adev, 
dm->cached_dc_state, false);
 
                amdgpu_dm_commit_zero_streams(dm->dc);
 
@@ -7102,7 +7103,8 @@ static void create_eml_sink(struct amdgpu_dm_connector 
*aconnector)
                aconnector->dc_sink = aconnector->dc_link->local_sink ?
                aconnector->dc_link->local_sink :
                aconnector->dc_em_sink;
-               dc_sink_retain(aconnector->dc_sink);
+               if (aconnector->dc_sink)
+                       dc_sink_retain(aconnector->dc_sink);
        }
 }
 
@@ -7929,7 +7931,8 @@ static int amdgpu_dm_connector_get_modes(struct 
drm_connector *connector)
                                drm_add_modes_noedid(connector, 1920, 1080);
        } else {
                amdgpu_dm_connector_ddc_get_modes(connector, edid);
-               amdgpu_dm_connector_add_common_modes(encoder, connector);
+               if (encoder)
+                       amdgpu_dm_connector_add_common_modes(encoder, 
connector);
                amdgpu_dm_connector_add_freesync_modes(connector, edid);
        }
        amdgpu_dm_fbc_init(connector);
-- 
2.45.1