linux-kernel - [PATCH v2] tifm: Remove usage of the deprecated "pci-dma-compat.h" API

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Message-Id: <b5296677f92f7bace957e66479b3d57a5a824ca1.1631942796.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 18 Sep 2021 07:32:26 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     oakad@...oo.com, arnd@...db.de, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH v2] tifm: Remove usage of the deprecated "pci-dma-compat.h" 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].

Finally, Arnd Bergmann reminded that the documentation was updated 11 years
ago to only describe the modern linux/dma-mapping.h interfaces and mark the
old bus-specific ones as no longer recommended, see commit 216bf58f4092
("Documentation: convert PCI-DMA-mapping.txt to use the generic DMA API").

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

@@
expression e1, e2, e3, e4;
@@
-    pci_map_sg(e1, e2, e3, e4)
+    dma_map_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_unmap_sg(e1, e2, e3, e4)
+    dma_unmap_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2;
@@
-    pci_set_dma_mask(e1, e2)
+    dma_set_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>
---
v2: Change Subject to be more explicit
    Keep only relevant part of the coccinelle script
    Try to improve the commit message to give some reason of why this change is done
---
 drivers/misc/tifm_7xx1.c | 2 +-
 drivers/misc/tifm_core.c | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/tifm_7xx1.c b/drivers/misc/tifm_7xx1.c
index 228f2eb1d476..017c2f7d6287 100644
--- a/drivers/misc/tifm_7xx1.c
+++ b/drivers/misc/tifm_7xx1.c
@@ -311,7 +311,7 @@ static int tifm_7xx1_probe(struct pci_dev *dev,
 	int pci_dev_busy = 0;
 	int rc;
 
-	rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
+	rc = dma_set_mask(&dev->dev, DMA_BIT_MASK(32));
 	if (rc)
 		return rc;
 
diff --git a/drivers/misc/tifm_core.c b/drivers/misc/tifm_core.c
index 2bb46b1f4be3..a3098fea3bf7 100644
--- a/drivers/misc/tifm_core.c
+++ b/drivers/misc/tifm_core.c
@@ -292,14 +292,15 @@ EXPORT_SYMBOL(tifm_has_ms_pif);
 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 		int direction)
 {
-	return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
+	return dma_map_sg(&to_pci_dev(sock->dev.parent)->dev, sg, nents,
+			  direction);
 }
 EXPORT_SYMBOL(tifm_map_sg);
 
 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 		   int direction)
 {
-	pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
+	dma_unmap_sg(&to_pci_dev(sock->dev.parent)->dev, sg, nents, direction);
 }
 EXPORT_SYMBOL(tifm_unmap_sg);
 
-- 
2.30.2