[PATCH review-only 09/17] io_uring/zcrx: split dmabuf unmap and release

[Pavel Begunkov <asml.silence@gmail.com>]

Until now unmapping and destroying dmabuf were the same thing. To keep
it consistent with non-dmabuf, split it into two separate helpers. Unmap
destroys mappings and attachements as it should, and release only
putting down the dmabuf fd reference.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/zcrx.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 79099a78f8cd..86e8046e98c4 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -121,21 +121,25 @@ static int io_populate_area_dma(struct io_zcrx_ifq *ifq,
 	return 0;
 }
 
-static void io_release_dmabuf(struct io_zcrx_mem *mem)
+static void io_unmap_dmabuf(struct io_zcrx_mem *mem)
 {
 	if (!IS_ENABLED(CONFIG_DMA_SHARED_BUFFER))
 		return;
-
 	if (mem->sgt)
 		dma_buf_unmap_attachment_unlocked(mem->attach, mem->sgt,
 						  DMA_FROM_DEVICE);
 	if (mem->attach)
 		dma_buf_detach(mem->dmabuf, mem->attach);
-	if (mem->dmabuf)
-		dma_buf_put(mem->dmabuf);
-
 	mem->sgt = NULL;
 	mem->attach = NULL;
+}
+
+static void io_release_dmabuf(struct io_zcrx_mem *mem)
+{
+	if (!IS_ENABLED(CONFIG_DMA_SHARED_BUFFER))
+		return;
+	if (mem->dmabuf)
+		dma_buf_put(mem->dmabuf);
 	mem->dmabuf = NULL;
 }
 
@@ -190,6 +194,7 @@ static int io_import_dmabuf(struct io_zcrx_ifq *ifq,
 	mem->size = len;
 	return 0;
 err:
+	io_unmap_dmabuf(mem);
 	io_release_dmabuf(mem);
 	return ret;
 }
@@ -317,7 +322,7 @@ static void io_zcrx_unmap_area(struct io_zcrx_ifq *ifq,
 	}
 
 	if (area->mem.is_dmabuf) {
-		io_release_dmabuf(&area->mem);
+		io_unmap_dmabuf(&area->mem);
 	} else {
 		dma_unmap_sgtable(ifq->dev, &area->mem.page_sg_table,
 				  DMA_FROM_DEVICE, IO_DMA_ATTR);
-- 
2.54.0