gigaset: fix reject/hangup handling

Signal D channel disconnect in a few cases where it was missed,
including when an incoming call is disconnected before it was
accepted.

Impact: error handling improvement
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/isdn/gigaset/ev-layer.c b/drivers/isdn/gigaset/ev-layer.c
index 2d91049571a..ff2ec2ce216 100644
--- a/drivers/isdn/gigaset/ev-layer.c
+++ b/drivers/isdn/gigaset/ev-layer.c
@@ -707,6 +707,11 @@ static void disconnect(struct at_state_t **at_state_p)
         if (bcs) {
                 /* B channel assigned: invoke hardware specific handler */
                 cs->ops->close_bchannel(bcs);
+                /* notify LL */
+                if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
+                        bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
+                        gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
+                }
         } else {
                 /* no B channel assigned: just deallocate */
                 spin_lock_irqsave(&cs->lock, flags);