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path: root/drivers/isdn/capi/capi.c
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Diffstat (limited to 'drivers/isdn/capi/capi.c')
-rw-r--r--drivers/isdn/capi/capi.c181
1 files changed, 88 insertions, 93 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 9d7c3692c7d7..403bf8fcb285 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -141,7 +141,7 @@ struct capidev {
struct capincci *nccis;
- struct mutex ncci_list_mtx;
+ struct mutex lock;
};
/* -------- global variables ---------------------------------------- */
@@ -574,38 +574,31 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
u16 datahandle;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
struct capincci *np;
- u32 ncci;
unsigned long flags;
+ mutex_lock(&cdev->lock);
+
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
u16 info = CAPIMSG_U16(skb->data, 12); // Info field
- if ((info & 0xff00) == 0) {
- mutex_lock(&cdev->ncci_list_mtx);
+ if ((info & 0xff00) == 0)
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
- mutex_unlock(&cdev->ncci_list_mtx);
- }
}
- if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
- mutex_lock(&cdev->ncci_list_mtx);
+ if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
- mutex_unlock(&cdev->ncci_list_mtx);
- }
+
spin_lock_irqsave(&workaround_lock, flags);
if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
- spin_unlock_irqrestore(&workaround_lock, flags);
- return;
+ goto unlock_out;
}
- ncci = CAPIMSG_CONTROL(skb->data);
- for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
- ;
+
+ np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
if (!np) {
printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
- spin_unlock_irqrestore(&workaround_lock, flags);
- return;
+ goto unlock_out;
}
#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -618,8 +611,7 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
if (!mp) {
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
- spin_unlock_irqrestore(&workaround_lock, flags);
- return;
+ goto unlock_out;
}
if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
@@ -652,7 +644,9 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
+unlock_out:
spin_unlock_irqrestore(&workaround_lock, flags);
+ mutex_unlock(&cdev->lock);
}
/* -------- file_operations for capidev ----------------------------- */
@@ -730,9 +724,9 @@ 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) {
- mutex_lock(&cdev->ncci_list_mtx);
+ mutex_lock(&cdev->lock);
capincci_free(cdev, CAPIMSG_NCCI(skb->data));
- mutex_unlock(&cdev->ncci_list_mtx);
+ mutex_unlock(&cdev->lock);
}
cdev->errcode = capi20_put_message(&cdev->ap, skb);
@@ -765,30 +759,35 @@ capi_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct capidev *cdev = file->private_data;
- struct capi20_appl *ap = &cdev->ap;
capi_ioctl_struct data;
int retval = -EINVAL;
void __user *argp = (void __user *)arg;
switch (cmd) {
case CAPI_REGISTER:
- {
- if (ap->applid)
- return -EEXIST;
+ mutex_lock(&cdev->lock);
- if (copy_from_user(&cdev->ap.rparam, argp,
- sizeof(struct capi_register_params)))
- return -EFAULT;
-
- cdev->ap.private = cdev;
- cdev->ap.recv_message = capi_recv_message;
- cdev->errcode = capi20_register(ap);
- if (cdev->errcode) {
- ap->applid = 0;
- return -EIO;
- }
+ if (cdev->ap.applid) {
+ retval = -EEXIST;
+ goto register_out;
+ }
+ if (copy_from_user(&cdev->ap.rparam, argp,
+ sizeof(struct capi_register_params))) {
+ retval = -EFAULT;
+ goto register_out;
+ }
+ cdev->ap.private = cdev;
+ cdev->ap.recv_message = capi_recv_message;
+ cdev->errcode = capi20_register(&cdev->ap);
+ retval = (int)cdev->ap.applid;
+ if (cdev->errcode) {
+ cdev->ap.applid = 0;
+ retval = -EIO;
}
- return (int)ap->applid;
+
+register_out:
+ mutex_unlock(&cdev->lock);
+ return retval;
case CAPI_GET_VERSION:
{
@@ -887,68 +886,67 @@ capi_ioctl(struct inode *inode, struct file *file,
return 0;
case CAPI_SET_FLAGS:
- case CAPI_CLR_FLAGS:
- {
- unsigned userflags;
- if (copy_from_user(&userflags, argp,
- sizeof(userflags)))
- return -EFAULT;
- if (cmd == CAPI_SET_FLAGS)
- cdev->userflags |= userflags;
- else
- cdev->userflags &= ~userflags;
- }
- return 0;
+ case CAPI_CLR_FLAGS: {
+ unsigned userflags;
+
+ if (copy_from_user(&userflags, argp, sizeof(userflags)))
+ return -EFAULT;
+ mutex_lock(&cdev->lock);
+ if (cmd == CAPI_SET_FLAGS)
+ cdev->userflags |= userflags;
+ else
+ cdev->userflags &= ~userflags;
+ mutex_unlock(&cdev->lock);
+ return 0;
+ }
case CAPI_GET_FLAGS:
if (copy_to_user(argp, &cdev->userflags,
sizeof(cdev->userflags)))
return -EFAULT;
return 0;
- case CAPI_NCCI_OPENCOUNT:
- {
- struct capincci *nccip;
- unsigned ncci;
- int count = 0;
- if (copy_from_user(&ncci, argp, sizeof(ncci)))
- return -EFAULT;
+ case CAPI_NCCI_OPENCOUNT: {
+ struct capincci *nccip;
+ unsigned ncci;
+ int count = 0;
- mutex_lock(&cdev->ncci_list_mtx);
- if ((nccip = capincci_find(cdev, (u32) ncci)) == NULL) {
- mutex_unlock(&cdev->ncci_list_mtx);
- return 0;
- }
- count += capincci_minor_opencount(nccip);
- mutex_unlock(&cdev->ncci_list_mtx);
- return count;
- }
- return 0;
+ if (copy_from_user(&ncci, argp, sizeof(ncci)))
+ return -EFAULT;
+
+ mutex_lock(&cdev->lock);
+ nccip = capincci_find(cdev, (u32)ncci);
+ if (nccip)
+ count = capincci_minor_opencount(nccip);
+ mutex_unlock(&cdev->lock);
+ return count;
+ }
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
- case CAPI_NCCI_GETUNIT:
- {
- struct capincci *nccip;
- struct capiminor *mp;
- unsigned ncci;
- int unit = 0;
- if (copy_from_user(&ncci, argp,
- sizeof(ncci)))
- return -EFAULT;
- mutex_lock(&cdev->ncci_list_mtx);
- nccip = capincci_find(cdev, (u32) ncci);
- if (!nccip || (mp = nccip->minorp) == NULL) {
- mutex_unlock(&cdev->ncci_list_mtx);
- return -ESRCH;
- }
- unit = mp->minor;
- mutex_unlock(&cdev->ncci_list_mtx);
- return unit;
+ case CAPI_NCCI_GETUNIT: {
+ struct capincci *nccip;
+ struct capiminor *mp;
+ unsigned ncci;
+ int unit = -ESRCH;
+
+ if (copy_from_user(&ncci, argp, sizeof(ncci)))
+ return -EFAULT;
+
+ mutex_lock(&cdev->lock);
+ nccip = capincci_find(cdev, (u32)ncci);
+ if (nccip) {
+ mp = nccip->minorp;
+ if (mp)
+ unit = mp->minor;
}
- return 0;
+ mutex_unlock(&cdev->lock);
+ return unit;
+ }
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
+
+ default:
+ return -EINVAL;
}
- return -EINVAL;
}
static int capi_open(struct inode *inode, struct file *file)
@@ -959,7 +957,7 @@ static int capi_open(struct inode *inode, struct file *file)
if (!cdev)
return -ENOMEM;
- mutex_init(&cdev->ncci_list_mtx);
+ mutex_init(&cdev->lock);
skb_queue_head_init(&cdev->recvqueue);
init_waitqueue_head(&cdev->recvwait);
file->private_data = cdev;
@@ -979,15 +977,10 @@ static int capi_release(struct inode *inode, struct file *file)
list_del(&cdev->list);
mutex_unlock(&capidev_list_lock);
- if (cdev->ap.applid) {
+ if (cdev->ap.applid)
capi20_release(&cdev->ap);
- cdev->ap.applid = 0;
- }
skb_queue_purge(&cdev->recvqueue);
-
- mutex_lock(&cdev->ncci_list_mtx);
capincci_free(cdev, 0xffffffff);
- mutex_unlock(&cdev->ncci_list_mtx);
kfree(cdev);
return 0;
@@ -1446,11 +1439,13 @@ static int capi20ncci_proc_show(struct seq_file *m, void *v)
mutex_lock(&capidev_list_lock);
list_for_each(l, &capidev_list) {
cdev = list_entry(l, struct capidev, list);
+ mutex_lock(&cdev->lock);
for (np=cdev->nccis; np; np = np->next) {
seq_printf(m, "%d 0x%x\n",
cdev->ap.applid,
np->ncci);
}
+ mutex_unlock(&cdev->lock);
}
mutex_unlock(&capidev_list_lock);
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 06:44:57 +0100