[PATCH] Fix tty speed handling on 8250

[Alan Cox]

We try and write the correct speed back but the serial midlayer already
mangles the speed on us and that means if we request B0 we report back
B9600 when we should not. For now we'll hack around this in the drivers
and serial code, pending a better long term solution.

Signed-off-by: Alan Cox <alan@xxxxxxxxxx>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-rc2-mm1/drivers/serial/8250.c linux-2.6.25-rc2-mm1/drivers/serial/8250.c
--- linux.vanilla-2.6.25-rc2-mm1/drivers/serial/8250.c	2008-02-19 11:03:01.000000000 +0000
+++ linux-2.6.25-rc2-mm1/drivers/serial/8250.c	2008-02-20 16:31:16.000000000 +0000
@@ -2174,7 +2174,9 @@
 	}
 	serial8250_set_mctrl(&up->port, up->port.mctrl);
 	spin_unlock_irqrestore(&up->port.lock, flags);
-	tty_termios_encode_baud_rate(termios, baud, baud);
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
 }
 
 static void
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