isdn/capi: make reset_ctr op truly optional

[profile/ivi/kernel-x86-ivi.git] / drivers / isdn / capi / kcapi.c

diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index bd00dce..bde3c88 100644 (file)
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -1147,6 +1147,12 @@ load_unlock_out:
                if (ctr->state == CAPI_CTR_DETECTED)
                        goto reset_unlock_out;
 
+               if (ctr->reset_ctr == NULL) {
+                       printk(KERN_DEBUG "kcapi: reset: no reset function\n");
+                       retval = -ESRCH;
+                       goto reset_unlock_out;
+               }
+
                ctr->reset_ctr(ctr);
 
                retval = wait_on_ctr_state(ctr, CAPI_CTR_DETECTED);