[PATCH v2 1/4] drm/xe/vm: Use onion unwind for xe_vma_userptr_pin_pages()

["Thomas Hellström" <thomas.hellstrom@linux.intel.com>]

Use onion error unwind since that makes the function easier to read
and extend. No functional change.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 37 +++++++++++++++++++------------------
 1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 2e99f865d7ec..8bf7f62e6548 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -116,19 +116,17 @@ int xe_vma_userptr_pin_pages(struct xe_vma *vma)
 		kthread_unuse_mm(vma->userptr.notifier.mm);
 		mmput(vma->userptr.notifier.mm);
 	}
-mm_closed:
 	if (ret)
-		goto out;
+		goto out_release_pages;
 
 	ret = sg_alloc_table_from_pages_segment(&vma->userptr.sgt, pages,
 						pinned, 0,
 						(u64)pinned << PAGE_SHIFT,
 						xe_sg_segment_size(xe->drm.dev),
 						GFP_KERNEL);
-	if (ret) {
-		vma->userptr.sg = NULL;
-		goto out;
-	}
+	if (ret)
+		goto out_release_pages;
+
 	vma->userptr.sg = &vma->userptr.sgt;
 
 	ret = dma_map_sgtable(xe->drm.dev, vma->userptr.sg,
@@ -136,11 +134,8 @@ int xe_vma_userptr_pin_pages(struct xe_vma *vma)
 			      DMA_BIDIRECTIONAL,
 			      DMA_ATTR_SKIP_CPU_SYNC |
 			      DMA_ATTR_NO_KERNEL_MAPPING);
-	if (ret) {
-		sg_free_table(vma->userptr.sg);
-		vma->userptr.sg = NULL;
-		goto out;
-	}
+	if (ret)
+		goto out_free_sg;
 
 	for (i = 0; i < pinned; ++i) {
 		if (!read_only) {
@@ -152,17 +147,23 @@ int xe_vma_userptr_pin_pages(struct xe_vma *vma)
 		mark_page_accessed(pages[i]);
 	}
 
-out:
 	release_pages(pages, pinned);
 	kvfree(pages);
 
-	if (!(ret < 0)) {
-		vma->userptr.notifier_seq = notifier_seq;
-		if (xe_vma_userptr_check_repin(vma) == -EAGAIN)
-			goto retry;
-	}
+	vma->userptr.notifier_seq = notifier_seq;
+	if (xe_vma_userptr_check_repin(vma) == -EAGAIN)
+		goto retry;
+
+	return 0;
 
-	return ret < 0 ? ret : 0;
+out_free_sg:
+	sg_free_table(vma->userptr.sg);
+	vma->userptr.sg = NULL;
+out_release_pages:
+	release_pages(pages, pinned);
+mm_closed:
+	kvfree(pages);
+	return ret;
 }
 
 static bool preempt_fences_waiting(struct xe_vm *vm)
-- 
2.41.0