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PCI: Unify PCI and normal DMA direction definitions

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Current DMA direction definitions in pci-dma-compat.h and dma-direction.h
are mirrored in value.  Unify them to enhance readability and avoid
possible inconsistency.

Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
This commit is contained in:
Shunyong Yang 2018-07-18 09:40:35 +08:00 committed by Bjorn Helgaas
parent f7368a5502
commit 546c596cf5
2 changed files with 6 additions and 8 deletions
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6
include/linux/dma-direction.h
View file

@ -1,14 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_DMA_DIRECTION_H
#define _LINUX_DMA_DIRECTION_H
/*
* These definitions mirror those in pci.h, so they can be used
* interchangeably with their PCI_ counterparts.
*/
enum dma_data_direction {
DMA_BIDIRECTIONAL = 0,
DMA_TO_DEVICE = 1,
DMA_FROM_DEVICE = 2,
DMA_NONE = 3,
};
#endif

8
include/linux/pci-dma-compat.h
View file

@ -8,10 +8,10 @@
#include <linux/dma-mapping.h>
/* This defines the direction arg to the DMA mapping routines. */
#define PCI_DMA_BIDIRECTIONAL 0
#define PCI_DMA_TODEVICE 1
#define PCI_DMA_FROMDEVICE 2
#define PCI_DMA_NONE 3
#define PCI_DMA_BIDIRECTIONAL DMA_BIDIRECTIONAL
#define PCI_DMA_TODEVICE DMA_TO_DEVICE
#define PCI_DMA_FROMDEVICE DMA_FROM_DEVICE
#define PCI_DMA_NONE DMA_NONE
static inline void *
pci_alloc_consistent(struct pci_dev *hwdev, size_t size,