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drm/amd/display: Guard Freesync HDMI parsing with dc_lock

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[Why]
All calls into DC must be guarded by dc_lock because DC code
is not safe against multi-thread or re-entry.

[How]
Hold dc_lock when calling DC interfaces to parse Freesync HDMI.

Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Stylon Wang
2022-12-21 19:28:16 +08:00
committed by Alex Deucher
parent 3a9c6f9a61
commit 53f4da731b
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -10213,11 +10213,15 @@ static bool parse_edid_cea(struct amdgpu_dm_connector *aconnector,
struct amdgpu_hdmi_vsdb_info *vsdb_info)
{
struct amdgpu_device *adev = drm_to_adev(aconnector->base.dev);
bool ret;
mutex_lock(&adev->dm.dc_lock);
if (adev->dm.dmub_srv)
return parse_edid_cea_dmub(&adev->dm, edid_ext, len, vsdb_info);
ret = parse_edid_cea_dmub(&adev->dm, edid_ext, len, vsdb_info);
else
return parse_edid_cea_dmcu(&adev->dm, edid_ext, len, vsdb_info);
ret = parse_edid_cea_dmcu(&adev->dm, edid_ext, len, vsdb_info);
mutex_unlock(&adev->dm.dc_lock);
return ret;
}
static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,