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[ARM] Add a reference from struct device to the dma bounce info 

dmabounce keeps a per-device structure, and finds the correct
structure by walking a list.  Since architectures can now add
fields to struct device, we can attach this structure direct to
the struct device, thereby eliminating the code to search the
list.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-02-12 10:28:24 +00:00 committed by Russell King
parent 44b1869390
commit ab2c21529d
2 changed files with 16 additions and 25 deletions
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31
arch/arm/common/dmabounce.c
View File

@ -66,8 +66,6 @@ struct dmabounce_pool {
};
struct dmabounce_device_info {
struct list_head node;
struct device *dev;
struct list_head safe_buffers;
#ifdef STATS
@ -81,8 +79,6 @@ struct dmabounce_device_info {
rwlock_t lock;
};
static LIST_HEAD(dmabounce_devs);
#ifdef STATS
static void print_alloc_stats(struct dmabounce_device_info *device_info)
{
@ -96,19 +92,6 @@ static void print_alloc_stats(struct dmabounce_device_info *device_info)
}
#endif
/* find the given device in the dmabounce device list */
static inline struct dmabounce_device_info *
find_dmabounce_dev(struct device *dev)
{
struct dmabounce_device_info *d;
list_for_each_entry(d, &dmabounce_devs, node)
if (d->dev == dev)
return d;
return NULL;
}
/* allocate a 'safe' buffer and keep track of it */
static inline struct safe_buffer *
@ -231,7 +214,7 @@ static inline dma_addr_t
map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction dir)
{
struct dmabounce_device_info *device_info = find_dmabounce_dev(dev);
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
dma_addr_t dma_addr;
int needs_bounce = 0;
@ -292,7 +275,7 @@ static inline void
unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction dir)
{
struct dmabounce_device_info *device_info = find_dmabounce_dev(dev);
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
struct safe_buffer *buf = NULL;
/*
@ -343,7 +326,7 @@ static inline void
sync_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction dir)
{
struct dmabounce_device_info *device_info = find_dmabounce_dev(dev);
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
struct safe_buffer *buf = NULL;
if (device_info)
@ -606,7 +589,7 @@ dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
device_info->bounce_count = 0;
#endif
list_add(&device_info->node, &dmabounce_devs);
dev->archdata.dmabounce = device_info;
printk(KERN_INFO "dmabounce: registered device %s on %s bus\n",
dev->bus_id, dev->bus->name);
@ -623,7 +606,9 @@ dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
void
dmabounce_unregister_dev(struct device *dev)
{
struct dmabounce_device_info *device_info = find_dmabounce_dev(dev);
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
dev->archdata.dmabounce = NULL;
if (!device_info) {
printk(KERN_WARNING
@ -649,8 +634,6 @@ dmabounce_unregister_dev(struct device *dev)
print_map_stats(device_info);
#endif
list_del(&device_info->node);
kfree(device_info);
printk(KERN_INFO "dmabounce: device %s on %s bus unregistered\n",

10
include/asm-arm/device.h
View File

@ -3,5 +3,13 @@
*
* This file is released under the GPLv2
*/
#include <asm-generic/device.h>
#ifndef ASMARM_DEVICE_H
#define ASMARM_DEVICE_H
struct dev_archdata {
#ifdef CONFIG_DMABOUNCE
struct dmabounce_device_info *dmabounce;
#endif
};
#endif