[PATCH 5.15 023/155] drm/ttm: Dont leak a resource on eviction error

[Greg Kroah-Hartman]

From: Thomas Hellström <thomas.hellstrom at linux.intel.com>

[ Upstream commit e8188c461ee015ba0b9ab2fc82dbd5ebca5a5532 ]

On eviction errors other than -EMULTIHOP we were leaking a resource.
Fix.

v2:
- Avoid yet another goto (Andi Shyti)

Fixes: 403797925768 ("drm/ttm: Fix multihop assert on eviction.")
Cc: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Cc: Huang Rui <ray.huang at amd.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v5.15+
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com> #v1
Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230626091450.14757-4-thomas.hellstrom@linux.intel.com
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index cf390ab636978..6080f4b5c450c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -552,18 +552,18 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
 		goto out;
 	}
 
-bounce:
-	ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
-	if (ret == -EMULTIHOP) {
+	do {
+		ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
+		if (ret != -EMULTIHOP)
+			break;
+
 		ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem, ctx, &hop);
-		if (ret) {
-			if (ret != -ERESTARTSYS && ret != -EINTR)
-				pr_err("Buffer eviction failed\n");
-			ttm_resource_free(bo, &evict_mem);
-			goto out;
-		}
-		/* try and move to final place now. */
-		goto bounce;
+	} while (!ret);
+
+	if (ret) {
+		ttm_resource_free(bo, &evict_mem);
+		if (ret != -ERESTARTSYS && ret != -EINTR)
+			pr_err("Buffer eviction failed\n");
 	}
 out:
 	return ret;
-- 
2.39.2