tty: Always handle NULL flag ptr
Most line disciplines already handle the undocumented NULL flag
ptr in their .receive_buf method; however, several don't.
Document the NULL flag ptr, and correct handling in the
N_MOUSE, N_GSM0710 and N_R394 line disciplines.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index c0f76da..c09db11 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2269,14 +2269,15 @@
char *f;
int i;
char buf[64];
- char flags;
+ char flags = TTY_NORMAL;
if (debug & 4)
print_hex_dump_bytes("gsmld_receive: ", DUMP_PREFIX_OFFSET,
cp, count);
for (i = count, dp = cp, f = fp; i; i--, dp++) {
- flags = *f++;
+ if (f)
+ flags = *f++;
switch (flags) {
case TTY_NORMAL:
gsm->receive(gsm, *dp);