+ rapidio-use-dmaengine_get_dma_device-instead-of-chan-device-dev.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: rapidio: use dmaengine_get_dma_device() instead of chan->device->dev
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     rapidio-use-dmaengine_get_dma_device-instead-of-chan-device-dev.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/rapidio-use-dmaengine_get_dma_device-instead-of-chan-device-dev.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Frank Li <Frank.Li@nxp.com>
Subject: rapidio: use dmaengine_get_dma_device() instead of chan->device->dev
Date: Thu, 17 Sep 2026 16:50:12 -0400

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
Link: https://lore.kernel.org/20260917205016.1293317-1-Frank.Li@oss.nxp.com
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Vinod Koul <vkoul@kernel.org>
---

 drivers/rapidio/devices/rio_mport_cdev.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/rapidio/devices/rio_mport_cdev.c~rapidio-use-dmaengine_get_dma_device-instead-of-chan-device-dev
+++ a/drivers/rapidio/devices/rio_mport_cdev.c
@@ -555,7 +555,7 @@ static void dma_req_free(struct kref *re
 			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
 				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");
_

Patches currently in -mm which might be from Frank.Li@nxp.com are

rapidio-use-dmaengine_get_dma_device-instead-of-chan-device-dev.patch