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rapidio: use dmaengine_get_dma_device() instead of chan->device->dev

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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.

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>
Assisted-by: LLM
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>
This commit is contained in:
Frank Li 2026-09-17 16:50:12 -04:00 committed by Andrew Morton
parent f5263bee9e
commit 858e9d1a8b
1 changed files with 2 additions and 2 deletions
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4
drivers/rapidio/devices/rio_mport_cdev.c
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@ -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");