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COSA/SRP: convert channel_data.rsem to mutex

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COSA/SRP driver: The semaphore channel_data.rsem is used as a mutex,
convert it to the mutex API

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matthias Kaehlcke 2008-03-05 18:53:01 -08:00 committed by David S. Miller
parent ee6b967301
commit 6387c4bed5
1 changed files with 8 additions and 6 deletions
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14
drivers/net/wan/cosa.c
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@ -90,6 +90,7 @@
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/device.h>
#undef COSA_SLOW_IO /* for testing purposes only */
@ -127,7 +128,8 @@ struct channel_data {
int (*tx_done)(struct channel_data *channel, int size);
/* Character device parts */
struct semaphore rsem, wsem;
struct mutex rlock;
struct semaphore wsem;
char *rxdata;
int rxsize;
wait_queue_head_t txwaitq, rxwaitq;
@ -807,7 +809,7 @@ static struct net_device_stats *cosa_net_stats(struct net_device *dev)
static void chardev_channel_init(struct channel_data *chan)
{
init_MUTEX(&chan->rsem);
mutex_init(&chan->rlock);
init_MUTEX(&chan->wsem);
}
@ -825,12 +827,12 @@ static ssize_t cosa_read(struct file *file,
cosa->name, cosa->firmware_status);
return -EPERM;
}
if (down_interruptible(&chan->rsem))
if (mutex_lock_interruptible(&chan->rlock))
return -ERESTARTSYS;
if ((chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL)) == NULL) {
printk(KERN_INFO "%s: cosa_read() - OOM\n", cosa->name);
up(&chan->rsem);
mutex_unlock(&chan->rlock);
return -ENOMEM;
}
@ -848,7 +850,7 @@ static ssize_t cosa_read(struct file *file,
remove_wait_queue(&chan->rxwaitq, &wait);
current->state = TASK_RUNNING;
spin_unlock_irqrestore(&cosa->lock, flags);
up(&chan->rsem);
mutex_unlock(&chan->rlock);
return -ERESTARTSYS;
}
}
@ -857,7 +859,7 @@ static ssize_t cosa_read(struct file *file,
kbuf = chan->rxdata;
count = chan->rxsize;
spin_unlock_irqrestore(&cosa->lock, flags);
up(&chan->rsem);
mutex_unlock(&chan->rlock);
if (copy_to_user(buf, kbuf, count)) {
kfree(kbuf);