[Intel-xe] [PATCH 1/3] drm/xe: Handle unmapped userptr in analyze VM

[Matthew Brost <matthew.brost@intel.com>]

A corner exists where a userptr may have no mapping when analyze VM is
called, handle this case.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index d1c380ad7f6b..e4311c48cc54 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3453,9 +3453,13 @@ int xe_analyze_vm(struct drm_printer *p, struct xe_vm *vm, int gt_id)
 		if (is_userptr) {
 			struct xe_res_cursor cur;
 
-			xe_res_first_sg(vma->userptr.sg, 0, XE_PAGE_SIZE,
-					&cur);
-			addr = xe_res_dma(&cur);
+			if (vma->userptr.sg) {
+				xe_res_first_sg(vma->userptr.sg, 0, XE_PAGE_SIZE,
+						&cur);
+				addr = xe_res_dma(&cur);
+			} else {
+				addr = 0;
+			}
 		} else {
 			addr = __xe_bo_addr(vma->bo, 0, XE_PAGE_SIZE, &is_vram);
 		}
-- 
2.34.1