tty/n_gsm.c: get gsm->num after gsm_activate_mux

gsm->num is the index of gsm_mux[], it's invalid before calling gsm_activate_mux.

Signed-off-by: xinhui.pan <xinhuiX.pan@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 2ebe47b78a3e..81e7ccbd9e4a 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2230,8 +2230,7 @@ static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len)
 
 static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
 {
-        int ret, i;
-        int base = gsm->num << 6; /* Base for this MUX */
+        int ret, i, base;
 
         gsm->tty = tty_kref_get(tty);
         gsm->output = gsmld_output;
@@ -2241,6 +2240,7 @@ static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
         else {
                 /* Don't register device 0 - this is the control channel and not
                    a usable tty interface */
+                base = gsm->num << 6; /* Base for this MUX */
                 for (i = 1; i < NUM_DLCI; i++)
                         tty_register_device(gsm_tty_driver, base + i, NULL);
         }