diff options
| -rw-r--r-- | drivers/isdn/capi/capi.c | 54 |
1 files changed, 32 insertions, 22 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c index 173c899a1fb..2e541fa0202 100644 --- a/drivers/isdn/capi/capi.c +++ b/drivers/isdn/capi/capi.c @@ -87,6 +87,11 @@ struct capincci; #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE struct capiminor; +struct datahandle_queue { + struct list_head list; + u16 datahandle; +}; + struct capiminor { struct list_head list; struct capincci *nccip; @@ -109,12 +114,9 @@ struct capiminor { int outbytes; /* transmit path */ - struct datahandle_queue { - struct datahandle_queue *next; - u16 datahandle; - } *ackqueue; + struct list_head ackqueue; int nack; - + spinlock_t ackqlock; }; #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ @@ -156,48 +158,54 @@ static LIST_HEAD(capiminor_list); static int capincci_add_ack(struct capiminor *mp, u16 datahandle) { - struct datahandle_queue *n, **pp; + struct datahandle_queue *n; + unsigned long flags; n = kmalloc(sizeof(*n), GFP_ATOMIC); - if (!n) { - printk(KERN_ERR "capi: alloc datahandle failed\n"); - return -1; + if (unlikely(!n)) { + printk(KERN_ERR "capi: alloc datahandle failed\n"); + return -1; } - n->next = NULL; n->datahandle = datahandle; - for (pp = &mp->ackqueue; *pp; pp = &(*pp)->next) ; - *pp = n; + INIT_LIST_HEAD(&n->list); + spin_lock_irqsave(&mp->ackqlock, flags); + list_add_tail(&n->list, &mp->ackqueue); mp->nack++; + spin_unlock_irqrestore(&mp->ackqlock, flags); return 0; } static int capiminor_del_ack(struct capiminor *mp, u16 datahandle) { - struct datahandle_queue **pp, *p; + struct datahandle_queue *p, *tmp; + unsigned long flags; - for (pp = &mp->ackqueue; *pp; pp = &(*pp)->next) { - if ((*pp)->datahandle == datahandle) { - p = *pp; - *pp = (*pp)->next; + spin_lock_irqsave(&mp->ackqlock, flags); + list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { + if (p->datahandle == datahandle) { + list_del(&p->list); kfree(p); mp->nack--; + spin_unlock_irqrestore(&mp->ackqlock, flags); return 0; } } + spin_unlock_irqrestore(&mp->ackqlock, flags); return -1; } static void capiminor_del_all_ack(struct capiminor *mp) { - struct datahandle_queue **pp, *p; + struct datahandle_queue *p, *tmp; + unsigned long flags; - pp = &mp->ackqueue; - while (*pp) { - p = *pp; - *pp = (*pp)->next; + spin_lock_irqsave(&mp->ackqlock, flags); + list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { + list_del(&p->list); kfree(p); mp->nack--; } + spin_unlock_irqrestore(&mp->ackqlock, flags); } @@ -220,6 +228,8 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) mp->ncci = ncci; mp->msgid = 0; atomic_set(&mp->ttyopencount,0); + INIT_LIST_HEAD(&mp->ackqueue); + spin_lock_init(&mp->ackqlock); skb_queue_head_init(&mp->inqueue); skb_queue_head_init(&mp->outqueue); |