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;