linux-kernel - [RFC PATCH 1/3] RDMA/umem: Change for rdma devices has not dma device

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Date:   Wed,  8 Sep 2021 15:16:09 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Zhu Yanjun <zyjzyj2000@...il.com>
Cc:     Shunsuke Mie <mie@...l.co.jp>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jianxin Xiong <jianxin.xiong@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        dhobsong@...l.co.jp, taki@...l.co.jp, etom@...l.co.jp
Subject: [RFC PATCH 1/3] RDMA/umem: Change for rdma devices has not dma device

To share memory space using dma-buf, a API of the dma-buf requires dma
device, but devices such as rxe do not have a dma device. For those case,
change to specify a device of struct ib instead of the dma device.

Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
---
 drivers/infiniband/core/umem_dmabuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c
index c6e875619fac..58d6ac9cb51a 100644
--- a/drivers/infiniband/core/umem_dmabuf.c
+++ b/drivers/infiniband/core/umem_dmabuf.c
@@ -146,7 +146,7 @@ struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
 
 	umem_dmabuf->attach = dma_buf_dynamic_attach(
 					dmabuf,
-					device->dma_device,
+					device->dma_device ? device->dma_device : &device->dev,
 					ops,
 					umem_dmabuf);
 	if (IS_ERR(umem_dmabuf->attach)) {
-- 
2.17.1