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tty: n_gsm: Mark expected switch fall-throughs

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In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

drivers/tty/n_gsm.c: In function ‘gsm_dlci_data’:
drivers/tty/n_gsm.c:1582:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (tty) {
      ^
drivers/tty/n_gsm.c:1587:2: note: here
  case 1:
  ^~~~
drivers/tty/n_gsm.c: In function ‘gsm1_receive’:
  CC [M]  drivers/scsi/snic/snic_disc.o
  CC [M]  drivers/net/wireless/realtek/rtlwifi/pci.o
  CC      drivers/usb/early/xhci-dbc.o
drivers/tty/n_gsm.c:1981:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
   gsm->fcs = INIT_FCS;
            ^
drivers/tty/n_gsm.c:1983:2: note: here
  case GSM_ADDRESS: /* Address continuation */
  ^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2019-02-25 11:28:14 -06:00 committed by Greg Kroah-Hartman
parent be24c27018
commit 3e913eebdf
1 changed files with 6 additions and 9 deletions
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15
drivers/tty/n_gsm.c
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@ -1565,14 +1565,11 @@ static void gsm_dlci_data(struct gsm_dlci *dlci, const u8 *data, int clen)
pr_debug("%d bytes for tty\n", len);
switch (dlci->adaption) {
/* Unsupported types */
/* Packetised interruptible data */
case 4:
case 4: /* Packetised interruptible data */
break;
/* Packetised uininterruptible voice/data */
case 3:
case 3: /* Packetised uininterruptible voice/data */
break;
/* Asynchronous serial with line state in each frame */
case 2:
case 2: /* Asynchronous serial with line state in each frame */
while (gsm_read_ea(&modem, *data++) == 0) {
len--;
if (len == 0)
@ -1583,8 +1580,8 @@ static void gsm_dlci_data(struct gsm_dlci *dlci, const u8 *data, int clen)
gsm_process_modem(tty, dlci, modem, clen);
tty_kref_put(tty);
}
/* Line state will go via DLCI 0 controls only */
case 1:
/* Fall through */
case 1: /* Line state will go via DLCI 0 controls only */
default:
tty_insert_flip_string(port, data, len);
tty_flip_buffer_push(port);
@ -1979,7 +1976,7 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c)
gsm->address = 0;
gsm->state = GSM_ADDRESS;
gsm->fcs = INIT_FCS;
/* Drop through */
/* Fall through */
case GSM_ADDRESS: /* Address continuation */
gsm->fcs = gsm_fcs_add(gsm->fcs, c);
if (gsm_read_ea(&gsm->address, c))