isdn/gigaset: improve error handling querying firmware version

An out-of-place "OK" response to the "AT+GMR" (get firmware version)
command turns out to be, more often than not, a delayed response to
a previous command rather than an actual error, so continue waiting
for the version number in that case.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
CC: stable <stable@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/isdn/gigaset/ev-layer.c b/drivers/isdn/gigaset/ev-layer.c
index 624a8256a77f..685638ac1161 100644
--- a/drivers/isdn/gigaset/ev-layer.c
+++ b/drivers/isdn/gigaset/ev-layer.c
@@ -190,6 +190,7 @@ struct reply_t gigaset_tab_nocid[] =
                                                                   ACT_INIT} },
         {RSP_OK,        121, 121, -1,                     0,  0, {ACT_GOTVER,
                                                                   ACT_INIT} },
+        {RSP_NONE,      121, 121, -1,                   120,  0, {ACT_GETSTRING} },
 
 /* leave dle mode */
         {RSP_INIT,        0,   0, SEQ_DLE0,             201,  5, {0},   "^SDLE=0\r"},
@@ -1314,8 +1315,9 @@ static void do_action(int action, struct cardstate *cs,
                 s = ev->ptr;
 
                 if (!strcmp(s, "OK")) {
+                        /* OK without version string: assume old response */
                         *p_genresp = 1;
-                        *p_resp_code = RSP_ERROR;
+                        *p_resp_code = RSP_NONE;
                         break;
                 }