From: Alex Hung <[email protected]> [WHAT & HOW] drm_dp_dpcd_write() returns negative error on failure and thus returned values need to be checked.
This fixes 3 UNUSED_VALUE issues reported by Coverity. Reviewed-by: Rodrigo Siqueira <[email protected]> Signed-off-by: Alex Hung <[email protected]> Signed-off-by: Roman Li <[email protected]> --- .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 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 6923184a6536..8eaf292bc4eb 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 @@ -643,6 +643,8 @@ static bool execute_synaptics_rc_command(struct drm_dp_aux *aux, // write rc data memmove(rc_data, data, length); ret = drm_dp_dpcd_write(aux, SYNAPTICS_RC_DATA, rc_data, sizeof(rc_data)); + if (ret < 0) + goto err; } // write rc offset @@ -651,20 +653,21 @@ static bool execute_synaptics_rc_command(struct drm_dp_aux *aux, rc_offset[2] = (unsigned char) (offset >> 16) & 0xFF; rc_offset[3] = (unsigned char) (offset >> 24) & 0xFF; ret = drm_dp_dpcd_write(aux, SYNAPTICS_RC_OFFSET, rc_offset, sizeof(rc_offset)); + if (ret < 0) + goto err; // write rc length rc_length[0] = (unsigned char) length & 0xFF; rc_length[1] = (unsigned char) (length >> 8) & 0xFF; ret = drm_dp_dpcd_write(aux, SYNAPTICS_RC_LENGTH, rc_length, sizeof(rc_length)); + if (ret < 0) + goto err; // write rc cmd rc_cmd = cmd | 0x80; ret = drm_dp_dpcd_write(aux, SYNAPTICS_RC_COMMAND, &rc_cmd, sizeof(rc_cmd)); - - if (ret < 0) { - DRM_ERROR("%s: write cmd ..., err = %d\n", __func__, ret); - return false; - } + if (ret < 0) + goto err; // poll until active is 0 for (i = 0; i < 10; i++) { @@ -687,6 +690,10 @@ static bool execute_synaptics_rc_command(struct drm_dp_aux *aux, drm_dbg_dp(aux->drm_dev, "success = %d\n", success); return success; + +err: + DRM_ERROR("%s: write cmd ..., err = %d\n", __func__, ret); + return false; } static void apply_synaptics_fifo_reset_wa(struct drm_dp_aux *aux) -- 2.34.1
