linux-kernel - [PATCH 03/16] fpga: dfl: pci: Remove usage of the deprecated "pci-dma-compat.h" API

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Date:   Thu,  6 Jan 2022 22:49:20 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     arnd@...db.de, hch@...radead.org, akpm@...ux-foundation.org,
        hao.wu@...el.com, trix@...hat.com, mdf@...nel.org,
        yilun.xu@...el.com
Cc:     linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 03/16] fpga: dfl: pci: 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].

A coccinelle script has been used to perform the needed transformation.
It can be found in [3].


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.

The explicit 'ret = -EIO;' has been removed because
'dma_set_mask_and_coherent()' returns 0 or -EIO, so its return code can be
used directly.


[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/
[3]: https://lore.kernel.org/kernel-janitors/20200716192821.321233-1-christophe.jaillet@wanadoo.fr/

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Reviewed-by: Xu Yilun <yilun.xu@...el.com>
---
Reviewed in: https://lore.kernel.org/kernel-janitors/20210823025635.GA620145@yilunxu-OptiPlex-7050/
---
 drivers/fpga/dfl-pci.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
index 4d68719e608f..96a11084bef4 100644
--- a/drivers/fpga/dfl-pci.c
+++ b/drivers/fpga/dfl-pci.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/pci.h>
+#include <linux/dma-mapping.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -354,16 +355,10 @@ int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
 
 	pci_set_master(pcidev);
 
-	if (!pci_set_dma_mask(pcidev, DMA_BIT_MASK(64))) {
-		ret = pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(64));
-		if (ret)
-			goto disable_error_report_exit;
-	} else if (!pci_set_dma_mask(pcidev, DMA_BIT_MASK(32))) {
-		ret = pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(32));
-		if (ret)
-			goto disable_error_report_exit;
-	} else {
-		ret = -EIO;
+	ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(64));
+	if (ret)
+		ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32));
+	if (ret) {
 		dev_err(&pcidev->dev, "No suitable DMA support available.\n");
 		goto disable_error_report_exit;
 	}
-- 
2.32.0