linux-kernel - [PATCH] tty/n_gsm: fix bug in tiocmset

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Date:	Fri, 23 Sep 2011 10:59:43 +0200
From:	Nikola Diklic-Perin <diklic.perin.nikola@...il.com>
To:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Cc:	diklic.perin.nikola@...il.com
Subject: [PATCH] tty/n_gsm: fix bug in tiocmset

From: Nikola Diklic-Perin <diklic.perin.nikola@...il.com>

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@...il.com>
---
--- a/drivers/tty/n_gsm.c	2011-09-22 18:19:16.592480805 +0200
+++ b/drivers/tty/n_gsm.c	2011-09-21 16:15:29.506800052 +0200
@@ -2982,7 +2982,7 @@ static int gsmtty_tiocmset(struct tty_st
 	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) {
--
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