From: Mario Limonciello mario.limonciello@amd.com
commit 63ad5371cd1e379519395c49a4b6a652c36c98e5 upstream.
When UBSAN is enabled a case is shown on unplugging the display that this variable hasn't been initialized by `update_dsc_caps`, presumably when the display was unplugged it wasn't copied from the DPCD.
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1956497 Signed-off-by: Mario Limonciello mario.limonciello@amd.com Acked-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5604,6 +5604,7 @@ static void update_dsc_caps(struct amdgp struct dsc_dec_dpcd_caps *dsc_caps) { stream->timing.flags.DSC = 0; + dsc_caps->is_dsc_supported = false;
if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) { dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,