drm/amd/display: Check phantom_stream before it is used

dcn32_enable_phantom_stream can return null, so returned value
must be checked before used.

This fixes 1 NULL_RETURNS issue reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
index 3ed6d1fa0c4402fb784b93ef91855cbdaab61fc0..ee009716d39b1fe170c4ef73a9bd2643ca60cd9b 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
@@ -1717,6 +1717,9 @@ void dcn32_add_phantom_pipes(struct dc *dc, struct dc_state *context,
        // be a valid candidate for SubVP (i.e. has a plane, stream, doesn't
        // already have phantom pipe assigned, etc.) by previous checks.
        phantom_stream = dcn32_enable_phantom_stream(dc, context, pipes, pipe_cnt, index);
+       if (!phantom_stream)
+               return;
+
        dcn32_enable_phantom_plane(dc, context, phantom_stream, index);
 
        for (i = 0; i < dc->res_pool->pipe_count; i++) {