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use mutex instead of semaphore in CAPI 2.0 interface

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The CAPI 2.0 interface uses a semaphore as mutex.  Use the mutex API instead
of the (binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthias Kaehlcke 2007-05-08 00:32:43 -07:00 committed by Linus Torvalds
parent a7e27d5dd3
commit 9ea6e5d808
1 changed files with 17 additions and 16 deletions
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33
drivers/isdn/capi/capi.c
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@ -18,6 +18,7 @@
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <linux/mutex.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/wait.h>
@ -146,7 +147,7 @@ struct capidev {
struct capincci *nccis;
struct semaphore ncci_list_sem;
struct mutex ncci_list_mtx;
};
/* -------- global variables ---------------------------------------- */
@ -394,7 +395,7 @@ static struct capidev *capidev_alloc(void)
if (!cdev)
return NULL;
init_MUTEX(&cdev->ncci_list_sem);
mutex_init(&cdev->ncci_list_mtx);
skb_queue_head_init(&cdev->recvqueue);
init_waitqueue_head(&cdev->recvwait);
write_lock_irqsave(&capidev_list_lock, flags);
@ -413,9 +414,9 @@ static void capidev_free(struct capidev *cdev)
}
skb_queue_purge(&cdev->recvqueue);
down(&cdev->ncci_list_sem);
mutex_lock(&cdev->ncci_list_mtx);
capincci_free(cdev, 0xffffffff);
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
write_lock_irqsave(&capidev_list_lock, flags);
list_del(&cdev->list);
@ -602,15 +603,15 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
u16 info = CAPIMSG_U16(skb->data, 12); // Info field
if (info == 0) {
down(&cdev->ncci_list_sem);
mutex_lock(&cdev->ncci_list_mtx);
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
}
}
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
down(&cdev->ncci_list_sem);
mutex_lock(&cdev->ncci_list_mtx);
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
}
spin_lock_irqsave(&workaround_lock, flags);
if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
@ -751,9 +752,9 @@ capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos
CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
down(&cdev->ncci_list_sem);
mutex_lock(&cdev->ncci_list_mtx);
capincci_free(cdev, CAPIMSG_NCCI(skb->data));
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
}
cdev->errcode = capi20_put_message(&cdev->ap, skb);
@ -938,9 +939,9 @@ capi_ioctl(struct inode *inode, struct file *file,
if (copy_from_user(&ncci, argp, sizeof(ncci)))
return -EFAULT;
down(&cdev->ncci_list_sem);
mutex_lock(&cdev->ncci_list_mtx);
if ((nccip = capincci_find(cdev, (u32) ncci)) == 0) {
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
return 0;
}
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@ -948,7 +949,7 @@ capi_ioctl(struct inode *inode, struct file *file,
count += atomic_read(&mp->ttyopencount);
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
return count;
}
return 0;
@ -963,14 +964,14 @@ capi_ioctl(struct inode *inode, struct file *file,
if (copy_from_user(&ncci, argp,
sizeof(ncci)))
return -EFAULT;
down(&cdev->ncci_list_sem);
mutex_lock(&cdev->ncci_list_mtx);
nccip = capincci_find(cdev, (u32) ncci);
if (!nccip || (mp = nccip->minorp) == 0) {
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
return -ESRCH;
}
unit = mp->minor;
up(&cdev->ncci_list_sem);
mutex_unlock(&cdev->ncci_list_mtx);
return unit;
}
return 0;