linux-kernel - [PATCH] niu: switch from 'pci_' to 'dma

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Message-Id: <24bff575e35f3f5990d7c53741000a3ed29fb60a.1630094750.git.christophe.jaillet@wanadoo.fr>
Date:   Fri, 27 Aug 2021 22:06:37 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     davem@...emloft.net, kuba@...nel.org, gregkh@...uxfoundation.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] niu: switch from 'pci_' to 'dma_' API

In [1], Christoph Hellwig has proposed to remove the wrappers in
include/linux/pci-dma-compat.h.

Some reasons why this API should be removed have been given by Julia
Lawall in [2].

A coccinelle script has been used to perform the needed transformation
Only relevant parts are given below.

It has been hand modified to use 'dma_set_mask_and_coherent()' instead of
'pci_set_dma_mask()/pci_set_consistent_dma_mask()' when applicable.
This is less verbose.

Finally, the now useless 'dma_mask' variable has been removed.

It has been compile tested.

@@
expression e1, e2;
@@
-    pci_set_dma_mask(e1, e2)
+    dma_set_mask(&e1->dev, e2)

@@
expression e1, e2;
@@
-    pci_set_consistent_dma_mask(e1, e2)
+    dma_set_coherent_mask(&e1->dev, e2)


[1]: https://lore.kernel.org/kernel-janitors/20200421081257.GA131897@infradead.org/
[2]: https://lore.kernel.org/kernel-janitors/alpine.DEB.2.22.394.2007120902170.2424@hadrien/

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/ethernet/sun/niu.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 1501e8906be4..a68a01d1b2b1 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -9722,7 +9722,6 @@ static int niu_pci_init_one(struct pci_dev *pdev,
 	struct net_device *dev;
 	struct niu *np;
 	int err;
-	u64 dma_mask;
 
 	niu_driver_version();
 
@@ -9777,18 +9776,11 @@ static int niu_pci_init_one(struct pci_dev *pdev,
 		PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE |
 		PCI_EXP_DEVCTL_RELAX_EN);
 
-	dma_mask = DMA_BIT_MASK(44);
-	err = pci_set_dma_mask(pdev, dma_mask);
-	if (!err) {
+	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
+	if (!err)
 		dev->features |= NETIF_F_HIGHDMA;
-		err = pci_set_consistent_dma_mask(pdev, dma_mask);
-		if (err) {
-			dev_err(&pdev->dev, "Unable to obtain 44 bit DMA for consistent allocations, aborting\n");
-			goto err_out_release_parent;
-		}
-	}
 	if (err) {
-		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 		if (err) {
 			dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
 			goto err_out_release_parent;
-- 
2.30.2