[PATCH v3 6/7] drm/xe: Guard against NULL GT in xe_guc.c

[Jonathan Cavitt <jonathan.cavitt@intel.com>]

Static analysis reveals the following issue:
xe_device_lookup_gt is theoretically able to return NULL in some cases,
but several use cases don't check the return value before performing a
dereference, resulting in a NULL pointer dereference.

Use xe_device_get_gt in places where this is an issue.

v2: xe_assert root_gt is not NULL (Michal, Matt)

v3: Just use xe_device_get_gt

Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/xe/xe_guc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
index f0535fd82062..d94490979adc 100644
--- a/drivers/gpu/drm/xe/xe_guc.c
+++ b/drivers/gpu/drm/xe/xe_guc.c
@@ -466,7 +466,7 @@ static int guc_g2g_alloc(struct xe_guc *guc)
 		return 0;
 
 	if (gt->info.id != 0) {
-		struct xe_gt *root_gt = xe_device_lookup_gt(xe, 0);
+		struct xe_gt *root_gt = xe_device_get_gt(xe, 0);
 		struct xe_guc *root_guc = &root_gt->uc.guc;
 		struct xe_bo *bo;
 
-- 
2.43.0