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OpenCloudOS-Kernel
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firewire: convert client_list_lock to mutex 

So far it is only taken in non-atomic contexts.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2008-10-05 10:37:11 +02:00
parent cf417e5494
commit d67cfb9613
3 changed files with 14 additions and 16 deletions
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20
drivers/firewire/fw-cdev.c
View File

@ -24,6 +24,7 @@
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/vmalloc.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/preempt.h>
#include <linux/time.h>
@ -108,7 +109,6 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
{
struct fw_device *device;
struct client *client;
unsigned long flags;
device = fw_device_get_by_devt(inode->i_rdev);
if (device == NULL)
@ -133,9 +133,9 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
file->private_data = client;
spin_lock_irqsave(&device->client_list_lock, flags);
mutex_lock(&device->client_list_mutex);
list_add_tail(&client->link, &device->client_list);
spin_unlock_irqrestore(&device->client_list_lock, flags);
mutex_unlock(&device->client_list_mutex);
return 0;
}
@ -232,14 +232,11 @@ for_each_client(struct fw_device *device,
void (*callback)(struct client *client))
{
struct client *c;
unsigned long flags;
spin_lock_irqsave(&device->client_list_lock, flags);
mutex_lock(&device->client_list_mutex);
list_for_each_entry(c, &device->client_list, link)
callback(c);
spin_unlock_irqrestore(&device->client_list_lock, flags);
mutex_unlock(&device->client_list_mutex);
}
static void
@ -247,7 +244,7 @@ queue_bus_reset_event(struct client *client)
{
struct bus_reset *bus_reset;
bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
bus_reset = kzalloc(sizeof(*bus_reset), GFP_KERNEL);
if (bus_reset == NULL) {
fw_notify("Out of memory when allocating bus reset event\n");
return;
@ -988,7 +985,6 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
struct client *client = file->private_data;
struct event *e, *next_e;
struct client_resource *r, *next_r;
unsigned long flags;
if (client->buffer.pages)
fw_iso_buffer_destroy(&client->buffer, client->device->card);
@ -1007,9 +1003,9 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
list_for_each_entry_safe(e, next_e, &client->event_list, link)
kfree(e);
spin_lock_irqsave(&client->device->client_list_lock, flags);
mutex_lock(&client->device->client_list_mutex);
list_del(&client->link);
spin_unlock_irqrestore(&client->device->client_list_lock, flags);
mutex_unlock(&client->device->client_list_mutex);
fw_device_put(client->device);
kfree(client);

3
drivers/firewire/fw-device.c
View File

@ -27,6 +27,7 @@
#include <linux/idr.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/semaphore.h>
#include <linux/spinlock.h>
@ -1005,7 +1006,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
device->node = fw_node_get(node);
device->node_id = node->node_id;
device->generation = card->generation;
spin_lock_init(&device->client_list_lock);
mutex_init(&device->client_list_mutex);
INIT_LIST_HEAD(&device->client_list);
/*

7
drivers/firewire/fw-device.h
View File

@ -23,7 +23,7 @@
#include <linux/cdev.h>
#include <linux/idr.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <asm/atomic.h>
enum fw_device_state {
@ -65,9 +65,10 @@ struct fw_device {
bool cmc;
struct fw_card *card;
struct device device;
/* to prevent deadlocks, never take this lock with card->lock held */
spinlock_t client_list_lock;
struct mutex client_list_mutex;
struct list_head client_list;
u32 *config_rom;
size_t config_rom_length;
int config_rom_retries;