isdn/gigaset: leave DLE mode before hanging up

Some firmware releases of Gigaset M105 do not accept AT+VLS=0 command
in DLE mode, so always leave DLE mode before sending the command.

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 2e6963dc740e..e2383ece8e2e 100644
--- a/drivers/isdn/gigaset/ev-layer.c
+++ b/drivers/isdn/gigaset/ev-layer.c
@@ -1693,6 +1693,11 @@ static void process_command_flags(struct cardstate *cs)
         for (i = 0; i < cs->channels; ++i) {
                 bcs = cs->bcs + i;
                 if (bcs->at_state.pending_commands & PC_HUP) {
+                        if (cs->dle) {
+                                cs->curchannel = bcs->channel;
+                                schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
+                                return;
+                        }
                         bcs->at_state.pending_commands &= ~PC_HUP;
                         if (bcs->at_state.pending_commands & PC_CID) {
                                 /* not yet dialing: PC_NOCID is sufficient */