Re: [PATCH v2 4/4] drm/ttm: Don't leak a resource on swapout move error

From: Thomas Hellström
Date: Mon Jun 26 2023 - 08:25:16 EST


Hi, Christian,

Will you take a look at 2/4 as well? Will you merge these?

Thanks,

Thomas


On 6/26/23 13:33, Christian König wrote:
Am 26.06.23 um 11:14 schrieb Thomas Hellström:
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@xxxxxxx>
Cc: "Christian König" <ckoenig.leichtzumerken@xxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v5.14+
Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/gpu/drm/ttm/ttm_bo.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c0e3bbd21d3d..d9a8f227f310 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1166,6 +1166,7 @@ int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
          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;
          }
      }