linux-kernel - Re: [PATCH] isdn/i4l: Fix DLE handling for i4l-audio

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Date:	Fri, 04 Jan 2008 02:14:37 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	matthias@...bl.net
Cc:	linux-kernel@...r.kernel.org, kkeil@...e.de,
	kai.germaschewski@....de
Subject: Re: [PATCH] isdn/i4l: Fix DLE handling for i4l-audio

From: Matthias Goebl <matthias@...bl.net>
Date: Thu, 3 Jan 2008 23:00:03 +0100

> --- linux-2.6.23.12.orig/drivers/isdn/i4l/isdn_tty.c	2007-12-22 21:13:49.000000000 +0100
> +++ linux-2.6.23.12/drivers/isdn/i4l/isdn_tty.c	2007-12-26 11:37:18.000000000 +0100
> @@ -85,6 +85,8 @@
>  								tty_insert_flip_char(tty, DLE, 0);
>  							tty_insert_flip_char(tty, *dp++, 0);
>  						}
> +						if (*dp == DLE)
> +							tty_insert_flip_char(tty, DLE, 0);
>  						last = *dp;
>  					} else {
>  #endif

I'm not sure this part is correct.

Here, *dp will be assigned to 'last'.

The rest of the code (after the else block) then reads:

					if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
						tty_insert_flip_char(tty, last, 0xFF);
					else
						tty_insert_flip_char(tty, last, TTY_NORMAL);

which should push that character out to the TTY.

With your change we will push a DLE out twice in such a case,
and that doesn't seem right.

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