The dma_buf_detach() locks attach->dmabuf->resv and then unlocks dmabuf->resv, which could be a two different locks from a static code checker perspective. In particular this triggers Smatch to report the "double unlock" error. Make the locking pointers consistent.
Reported-by: Dan Carpenter <[email protected]> Link: https://lore.kernel.org/dri-devel/Y1fLfsccW3AS%2Fo+%2F@kili/ Fixes: 809d9c72c2f8 ("dma-buf: Move dma_buf_attach() to dynamic locking specification") Signed-off-by: Dmitry Osipenko <[email protected]> --- drivers/dma-buf/dma-buf.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index c40d72d318fd..6e33ef4fde34 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -998,9 +998,10 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) if (WARN_ON(!dmabuf || !attach)) return; - dma_resv_lock(attach->dmabuf->resv, NULL); + dma_resv_lock(dmabuf->resv, NULL); if (attach->sgt) { + WARN_ON(dmabuf != attach->dmabuf); __unmap_dma_buf(attach, attach->sgt, attach->dir); -- 2.37.3
