diff options
Diffstat (limited to 'drivers/isdn/gigaset/common.c')
| -rw-r--r-- | drivers/isdn/gigaset/common.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c index 15dc0fc28a96..1d2ae2e05e0b 100644 --- a/drivers/isdn/gigaset/common.c +++ b/drivers/isdn/gigaset/common.c @@ -207,6 +207,32 @@ int gigaset_get_channel(struct bc_state *bcs) return 1; } +struct bc_state *gigaset_get_free_channel(struct cardstate *cs) +{ + unsigned long flags; + int i; + + spin_lock_irqsave(&cs->lock, flags); + if (!try_module_get(cs->driver->owner)) { + gig_dbg(DEBUG_ANY, + "could not get module for allocating channel"); + spin_unlock_irqrestore(&cs->lock, flags); + return NULL; + } + for (i = 0; i < cs->channels; ++i) + if (!cs->bcs[i].use_count) { + ++cs->bcs[i].use_count; + cs->bcs[i].busy = 1; + spin_unlock_irqrestore(&cs->lock, flags); + gig_dbg(DEBUG_ANY, "allocated channel %d", i); + return cs->bcs + i; + } + module_put(cs->driver->owner); + spin_unlock_irqrestore(&cs->lock, flags); + gig_dbg(DEBUG_ANY, "no free channel"); + return NULL; +} + void gigaset_free_channel(struct bc_state *bcs) { unsigned long flags; |