tty/n_gsm: fix bug in tiocmset
Clear bitmask was not inverted before masking modem_tx.
Calling ioctl(fd, TIOCMBIC, TIOCM_RTS) results in:
[ 197.430000] pre_modem_tx: 0x00000006
[ 197.430000] clear: 0x00000004
[ 197.430000] set: 0x00000000
[ 197.440000] post_modem_tx: 0x00000004
which is wrong.
Signed-off-by: Nikola Diklic-Perin <diklic.perin.nikola@gmail.com>
Acked-by: Alan Cox <alan@linx.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 8d7766b..da3b31a 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2989,7 +2989,7 @@
struct gsm_dlci *dlci = tty->driver_data;
unsigned int modem_tx = dlci->modem_tx;
- modem_tx &= clear;
+ modem_tx &= ~clear;
modem_tx |= set;
if (modem_tx != dlci->modem_tx) {