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drm/amd/display: NULL pointer error during compliance test

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[Why]
Calls to disable/enable stream should be guarded with dc_lock.

[How]
Add dc_lock before calling into dc_link_handle_hpd_rx_irq.

Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Qingqing Zhuo 2020-10-01 15:56:28 -04:00 • committed by Alex Deucher
parent 983bcb4cbe
commit c8ea79a8a2
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -2560,10 +2560,11 @@ static void handle_hpd_rx_irq(void *param)
struct drm_device *dev = connector->dev;
struct dc_link *dc_link = aconnector->dc_link;
bool is_mst_root_connector = aconnector->mst_mgr.mst_state;
bool result = false;
enum dc_connection_type new_connection_type = dc_connection_none;
struct amdgpu_device *adev = drm_to_adev(dev);
#ifdef CONFIG_DRM_AMD_DC_HDCP
union hpd_irq_data hpd_irq_data;
struct amdgpu_device *adev = drm_to_adev(dev);
memset(&hpd_irq_data, 0, sizeof(hpd_irq_data));
#endif
@ -2576,13 +2577,15 @@ static void handle_hpd_rx_irq(void *param)
if (dc_link->type != dc_connection_mst_branch)
mutex_lock(&aconnector->hpd_lock);
mutex_lock(&adev->dm.dc_lock);
#ifdef CONFIG_DRM_AMD_DC_HDCP
if (dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL) &&
result = dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL);
#else
if (dc_link_handle_hpd_rx_irq(dc_link, NULL, NULL) &&
result = dc_link_handle_hpd_rx_irq(dc_link, NULL, NULL);
#endif
!is_mst_root_connector) {
mutex_unlock(&adev->dm.dc_lock);
if (result && !is_mst_root_connector) {
/* Downstream Port status changed. */
if (!dc_link_detect_sink(dc_link, &new_connection_type))
DRM_ERROR("KMS: Failed to detect connector\n");