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CAPI: Switch capiminor list to array 

Using a plain array of pointers simplifies the management of capiminors.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Kiszka 2010-02-08 10:12:23 +00:00 committed by David S. Miller
parent 884f5c4479
commit 81d17fe5e2
1 changed files with 35 additions and 40 deletions
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75
drivers/isdn/capi/capi.c
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@ -85,7 +85,6 @@ struct datahandle_queue {
};
struct capiminor {
struct list_head list;
struct capincci *nccip;
unsigned int minor;
struct dentry *capifs_dentry;
@ -151,8 +150,8 @@ static LIST_HEAD(capidev_list);
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
static DEFINE_RWLOCK(capiminor_list_lock);
static LIST_HEAD(capiminor_list);
static DEFINE_RWLOCK(capiminors_lock);
static struct capiminor **capiminors;
/* -------- datahandles --------------------------------------------- */
@ -213,8 +212,8 @@ static void capiminor_del_all_ack(struct capiminor *mp)
static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
{
struct capiminor *mp, *p;
unsigned int minor = 0;
struct capiminor *mp;
unsigned int minor;
unsigned long flags;
mp = kzalloc(sizeof(*mp), GFP_KERNEL);
@ -233,31 +232,23 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
skb_queue_head_init(&mp->inqueue);
skb_queue_head_init(&mp->outqueue);
/* Allocate the least unused minor number.
*/
write_lock_irqsave(&capiminor_list_lock, flags);
if (list_empty(&capiminor_list))
list_add(&mp->list, &capiminor_list);
else {
list_for_each_entry(p, &capiminor_list, list) {
if (p->minor > minor)
break;
minor++;
/* Allocate the least unused minor number. */
write_lock_irqsave(&capiminors_lock, flags);
for (minor = 0; minor < capi_ttyminors; minor++)
if (!capiminors[minor]) {
capiminors[minor] = mp;
break;
}
if (minor < capi_ttyminors) {
mp->minor = minor;
list_add(&mp->list, p->list.prev);
}
}
write_unlock_irqrestore(&capiminor_list_lock, flags);
write_unlock_irqrestore(&capiminors_lock, flags);
if (!(minor < capi_ttyminors)) {
if (minor == capi_ttyminors) {
printk(KERN_NOTICE "capi: out of minors\n");
kfree(mp);
kfree(mp);
return NULL;
}
mp->minor = minor;
return mp;
}
@ -265,9 +256,9 @@ static void capiminor_free(struct capiminor *mp)
{
unsigned long flags;
write_lock_irqsave(&capiminor_list_lock, flags);
list_del(&mp->list);
write_unlock_irqrestore(&capiminor_list_lock, flags);
write_lock_irqsave(&capiminors_lock, flags);
capiminors[mp->minor] = NULL;
write_unlock_irqrestore(&capiminors_lock, flags);
kfree_skb(mp->ttyskb);
mp->ttyskb = NULL;
@ -279,20 +270,16 @@ static void capiminor_free(struct capiminor *mp)
static struct capiminor *capiminor_find(unsigned int minor)
{
struct list_head *l;
struct capiminor *p = NULL;
struct capiminor *mp;
read_lock(&capiminor_list_lock);
list_for_each(l, &capiminor_list) {
p = list_entry(l, struct capiminor, list);
if (p->minor == minor)
break;
}
read_unlock(&capiminor_list_lock);
if (l == &capiminor_list)
if (minor >= capi_ttyminors)
return NULL;
return p;
read_lock(&capiminors_lock);
mp = capiminors[minor];
read_unlock(&capiminors_lock);
return mp;
}
/* -------- struct capincci ----------------------------------------- */
@ -1329,10 +1316,16 @@ static int capinc_tty_init(void)
if (capi_ttyminors <= 0)
capi_ttyminors = CAPINC_NR_PORTS;
drv = alloc_tty_driver(capi_ttyminors);
if (!drv)
capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
GFP_KERNEL);
if (!capiminors)
return -ENOMEM;
drv = alloc_tty_driver(capi_ttyminors);
if (!drv) {
kfree(capiminors);
return -ENOMEM;
}
drv->owner = THIS_MODULE;
drv->driver_name = "capi_nc";
drv->name = "capi";
@ -1349,6 +1342,7 @@ static int capinc_tty_init(void)
tty_set_operations(drv, &capinc_ops);
if (tty_register_driver(drv)) {
put_tty_driver(drv);
kfree(capiminors);
printk(KERN_ERR "Couldn't register capi_nc driver\n");
return -1;
}
@ -1363,6 +1357,7 @@ static void capinc_tty_exit(void)
if ((retval = tty_unregister_driver(drv)))
printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
put_tty_driver(drv);
kfree(capiminors);
}
#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */