We should be checking if drm_dp_dpcd_read() returns the size that we are asking it to read instead of just checking if it is greater than zero. So, compare the return value of drm_dp_dpcd_read() to the requested read size. Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx> --- v2: drop the WARN_ON(). --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c index 8d598b322e5b..9c1e91c2179e 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -511,8 +511,8 @@ bool dm_helpers_dp_read_dpcd( return false; } - return drm_dp_dpcd_read(&aconnector->dm_dp_aux.aux, address, - data, size) > 0; + return drm_dp_dpcd_read(&aconnector->dm_dp_aux.aux, address, data, + size) == size; } bool dm_helpers_dp_write_dpcd( -- 2.39.2
