[PATCH 5.15 492/532] drm/ttm: Dont leak a resource on swapout move error

[Greg Kroah-Hartman]

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

commit a590f03d8de7c4cb7ce4916dc7f2fd10711faabe upstream.

If moving the bo to system for swapout failed, we were leaking
a resource. Fix.

Fixes: bfa3357ef9ab ("drm/ttm: allocate resource object instead of embedding it v2")
Cc: Christian König <christian.koenig at amd.com>
Cc: "Christian König" <ckoenig.leichtzumerken at gmail.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v5.14+
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>
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/20230626091450.14757-5-thomas.hellstrom@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/ttm/ttm_bo.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1187,6 +1187,7 @@ int ttm_bo_swapout(struct ttm_buffer_obj
 		ret = ttm_bo_handle_move_mem(bo, evict_mem, true, &ctx, &hop);
 		if (unlikely(ret != 0)) {
 			WARN(ret == -EMULTIHOP, "Unexpected multihop in swaput - likely driver bug.\n");
+			ttm_resource_free(bo, &evict_mem);
 			goto out;
 		}
 	}