linux-kernel - [10/20] USB: ftdi_sio: fix TIOCSSERIAL baud

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Message-Id: <20120201201531.921362185@clark.kroah.org>
Date:	Wed, 01 Feb 2012 12:14:12 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Torbjörn Lofterud <torbjorn@...nxs.se>,
	Johan Hovold <jhovold@...il.com>
Subject: [10/20] USB: ftdi_sio: fix TIOCSSERIAL baud_base handling

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jhovold@...il.com>

commit eb833a9e0972f60beb4ab8104ad7ef6bf30f02fc upstream.

Return EINVAL if new baud_base does not match the current one.

The baud_base is device specific and can not be changed. This restores
the old (pre-2005) behaviour which was changed due to a
misunderstanding regarding this fact (see
https://lkml.org/lkml/2005/1/20/84).

Reported-by: Torbjörn Lofterud <torbjorn@...nxs.se>
Signed-off-by: Johan Hovold <jhovold@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/serial/ftdi_sio.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1351,8 +1351,7 @@ static int set_serial_info(struct tty_st
 		goto check_and_exit;
 	}
 
-	if ((new_serial.baud_base != priv->baud_base) &&
-	    (new_serial.baud_base < 9600)) {
+	if (new_serial.baud_base != priv->baud_base) {
 	    	unlock_kernel();
 		return -EINVAL;
 	}


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