diff options
| author | Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> | 2021-10-22 23:14:24 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-10-28 05:04:50 +0300 |
| commit | ad76744b041d8c87ef1c9adbb04fb7eaa20a179e (patch) | |
| tree | c9c3c7b485325a38cecd9ded1098d57f3f5bd022 /drivers | |
| parent | 54149d13f369e1ab02f36b91feee02069184c1d8 (diff) | |
| download | linux-ad76744b041d8c87ef1c9adbb04fb7eaa20a179e.tar.xz | |
drm/amd/display: Fix deadlock when falling back to v2 from v3
[Why]
A deadlock in the kernel occurs when we fallback from the V3 to V2
add_topology_to_display or remove_topology_to_display because they
both try to acquire the dtm_mutex but recursive locking isn't
supported on mutex_lock().
[How]
Make the mutex_lock/unlock more fine grained and move them up such that
they're only required for the psp invocation itself.
Fixes: bf62221e9d0e ("drm/amd/display: Add DCN3.1 HDCP support")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/hdcp/hdcp_psp.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_psp.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_psp.c index e9bd84ec027d..be61975f1470 100644 --- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_psp.c +++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_psp.c @@ -105,6 +105,7 @@ static enum mod_hdcp_status remove_display_from_topology_v3( dtm_cmd->dtm_status = TA_DTM_STATUS__GENERIC_FAILURE; psp_dtm_invoke(psp, dtm_cmd->cmd_id); + mutex_unlock(&psp->dtm_context.mutex); if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) { status = remove_display_from_topology_v2(hdcp, index); @@ -115,8 +116,6 @@ static enum mod_hdcp_status remove_display_from_topology_v3( HDCP_TOP_REMOVE_DISPLAY_TRACE(hdcp, display->index); } - mutex_unlock(&psp->dtm_context.mutex); - return status; } @@ -205,6 +204,7 @@ static enum mod_hdcp_status add_display_to_topology_v3( dtm_cmd->dtm_in_message.topology_update_v3.link_hdcp_cap = link->hdcp_supported_informational; psp_dtm_invoke(psp, dtm_cmd->cmd_id); + mutex_unlock(&psp->dtm_context.mutex); if (dtm_cmd->dtm_status != TA_DTM_STATUS__SUCCESS) { status = add_display_to_topology_v2(hdcp, display); @@ -214,8 +214,6 @@ static enum mod_hdcp_status add_display_to_topology_v3( HDCP_TOP_ADD_DISPLAY_TRACE(hdcp, display->index); } - mutex_unlock(&psp->dtm_context.mutex); - return status; } |