Hello Melissa Wen,
This is a semi-automatic email about new static checker warnings.
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:6683
amdgpu_dm_connector_funcs_force()
warn: variable dereferenced before check 'dc_link' (see line 6663)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c
6662
6663 if (dc_link->aux_mode)
^^^^^^^^^
The patch adds an unchecked dereference
6664 ddc = &aconnector->dm_dp_aux.aux.ddc;
6665 else
6666 ddc = &aconnector->i2c->base;
6667
6668 /*
6669 * Note: drm_get_edid gets edid in the following order:
6670 * 1) override EDID if set via edid_override debugfs,
6671 * 2) firmware EDID if set via edid_firmware module parameter
6672 * 3) regular DDC read.
6673 */
6674 edid = drm_get_edid(connector, ddc);
6675 if (!edid) {
6676 DRM_ERROR("No EDID found on connector: %s.\n",
connector->name);
6677 return;
6678 }
6679
6680 aconnector->edid = edid;
6681
6682 /* Update emulated (virtual) sink's EDID */
6683 if (dc_em_sink && dc_link) {
^^^^^^^
The existing code assumed dc_link could be NULL? Can it? If not then
let's delete this check.
6684 memset(&dc_em_sink->edid_caps, 0, sizeof(struct
dc_edid_caps));
6685 memmove(dc_em_sink->dc_edid.raw_edid, edid,
(edid->extensions + 1) * EDID_LENGTH);
regards,
dan carpenter
