Re: [PATCH] dmaengine: idxd: Simplify code and axe the use of a deprecated API

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On 7/7/2021 10:08 PM, Christophe JAILLET wrote:
The wrappers in include/linux/pci-dma-compat.h should go away.

Replace 'pci_set_dma_mask/pci_set_consistent_dma_mask' by an equivalent
and less verbose 'dma_set_mask_and_coherent()' call.

Even if the code may look different, it should have exactly the same
run-time behavior.
If pci_set_dma_mask(64) fails and pci_set_dma_mask(32) succeeds, then
pci_set_consistent_dma_mask(64) will also fail.

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>

Acked-by: Dave Jiang <dave.jiang@xxxxxxxxx>

thanks.

---
If needed, see post from Christoph Hellwig on the kernel-janitors ML:
    https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
---
  drivers/dma/idxd/init.c | 10 ++--------
  1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index c8ae41d36040..de300ba38b14 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -637,15 +637,9 @@ static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  	}
dev_dbg(dev, "Set DMA masks\n");
-	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
  	if (rc)
-		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
-	if (rc)
-		goto err;
-
-	rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
-	if (rc)
-		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+		rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  	if (rc)
  		goto err;



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