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Hari Mishal
217f64f348
dm_dp_mst_is_port_support_mode() reads aconnector->dc_sink->dsc_caps... for the DSC branch-throughput check, and get_conv_frl_bw()'s HDMI-PCON FRL-bandwidth path reads aconnector->dc_sink->edid_caps.max_frl_rate, both without a NULL check. dc_sink is cleared asynchronously on MST unplug, and both functions run from paths that the driver's own comments document as racing that teardown: the connector probe worker's ->mode_valid callback and a compositor's atomic check, neither of which holds the MST manager lock that the teardown path uses. The former does have an existing dsc_aux NULL check, but dsc_aux isn't reliably cleared in every path that clears dc_sink, so it doesn't cover this. Fail the port-support check and skip the FRL conversion path when the sink is already gone. Fixes:f04d275d94("drm/amd/display: add mst port output bw check") Fixes:5c9b8b27a8("drm/amd/display: Tie FRL support into amdgpu_dm") Assisted-by: gkh_clanker_t1000 Signed-off-by: Hari Mishal <[email protected]> Reviewed-by: Fangzhi Zuo <[email protected]> Tested-by: Daniel Wheeler <[email protected]> Signed-off-by: Alex Deucher <[email protected]> (cherry picked from commit 7c3db8da4e039698ae198c870712428644e965c7) Cc: [email protected]