[PATCH v3 4/7] drm/xe: Guard against NULL GT in xe_sriov_vf.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 a relevant issue.

v2:
 - Use xe_assert in vf_post_migration_recovery (Michal)
v3:
 - Rebase
 - Use xe_device_get_gt

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

diff --git a/drivers/gpu/drm/xe/xe_sriov_vf.c b/drivers/gpu/drm/xe/xe_sriov_vf.c
index 189b307901a3..911d5720917b 100644
--- a/drivers/gpu/drm/xe/xe_sriov_vf.c
+++ b/drivers/gpu/drm/xe/xe_sriov_vf.c
@@ -166,7 +166,7 @@ static void vf_migration_init_early(struct xe_device *xe)
 	if (!IS_DGFX(xe)) {
 		struct xe_uc_fw_version guc_version;
 
-		xe_gt_sriov_vf_guc_versions(xe_device_lookup_gt(xe, 0), NULL, &guc_version);
+		xe_gt_sriov_vf_guc_versions(xe_device_get_gt(xe, 0), NULL, &guc_version);
 		if (MAKE_GUC_VER_STRUCT(guc_version) < MAKE_GUC_VER(1, 23, 0))
 			return vf_disable_migration(xe,
 						    "CCS migration requires GuC ABI >= 1.23 but only %u.%u found",
-- 
2.43.0