[PATCH 6.11 214/558] drm/xe/hdcp: Check GSC structure validity

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

6.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>

[ Upstream commit b4224f6bae3801d589f815672ec62800a1501b0d ]

Sometimes xe_gsc is not initialized when checked at HDCP capability
check. Add gsc structure check to avoid null pointer error.

Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
Reviewed-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240722064451.3610512-4-suraj.kandpal@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/xe/display/xe_hdcp_gsc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c b/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c
index 990285aa9b261..0af667ebebf98 100644
--- a/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c
+++ b/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c
@@ -40,10 +40,14 @@ bool intel_hdcp_gsc_check_status(struct xe_device *xe)
 {
 	struct xe_tile *tile = xe_device_get_root_tile(xe);
 	struct xe_gt *gt = tile->media_gt;
+	struct xe_gsc *gsc = &gt->uc.gsc;
 	bool ret = true;
 
-	if (!xe_uc_fw_is_enabled(&gt->uc.gsc.fw))
+	if (!gsc && !xe_uc_fw_is_enabled(&gsc->fw)) {
+		drm_dbg_kms(&xe->drm,
+			    "GSC Components not ready for HDCP2.x\n");
 		return false;
+	}
 
 	xe_pm_runtime_get(xe);
 	if (xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC)) {
@@ -53,7 +57,7 @@ bool intel_hdcp_gsc_check_status(struct xe_device *xe)
 		goto out;
 	}
 
-	if (!xe_gsc_proxy_init_done(&gt->uc.gsc))
+	if (!xe_gsc_proxy_init_done(gsc))
 		ret = false;
 
 	xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC);
-- 
2.43.0