[PATCH 1/1] rapidio: use dmaengine_get_dma_device() instead of chan->device->dev

[Frank.Li@oss.nxp.com]

From: Frank Li <Frank.Li@nxp.com>

Replace direct dma_chan::device::dev access with the proper
dmaengine_get_dma_device() for consumer API.

chan->device->dev is not always the device used for DMA mapping.
Some DMA engines support per-channel IOMMU mappings, so different
channels may use different DMA devices.  dmaengine_get_dma_device()
returns the correct device for each channel.

This also prepares for making the DMA engine provider data structures
private. DMA consumers should not access DMA engine internals directly.

Assisted-by: LLM
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
Cc: imx@lists.linux.dev
Cc: vkoul@kernel.org
---
 drivers/rapidio/devices/rio_mport_cdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 47ba34b4afb29..40d2953a9a7f9 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -555,7 +555,7 @@ static void dma_req_free(struct kref *ref)
 			refcount);
 	struct mport_cdev_priv *priv = req->priv;
 
-	dma_unmap_sg(req->dmach->device->dev,
+	dma_unmap_sg(dmaengine_get_dma_device(req->dmach),
 		     req->sgt.sgl, req->sgt.nents, req->dir);
 	sg_free_table(&req->sgt);
 	if (req->page_list) {
@@ -916,7 +916,7 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
 				xfer->offset, xfer->length);
 	}
 
-	nents = dma_map_sg(chan->device->dev,
+	nents = dma_map_sg(dmaengine_get_dma_device(chan),
 			   req->sgt.sgl, req->sgt.nents, dir);
 	if (nents == 0) {
 		rmcd_error("Failed to map SG list");
-- 
2.43.0