linux-kernel - Re: [PATCH] serial: off by one

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Message-Id: <20090603.211823.192890836.davem@davemloft.net>
Date:	Wed, 03 Jun 2009 21:18:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	roel.kluin@...il.com
Cc:	macro@...ux-mips.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] serial: off by one

From: Roel Kluin <roel.kluin@...il.com>
Date: Thu, 04 Jun 2009 01:20:33 +0200

> In zs_console_putchar() occurs:
> 
> 	if (zs_transmit_drain(zport, irq))
> 		write_zsdata(zport, ch);
> 
> However if in zs_transmit_drain() no empty Tx Buffer occurs, limit reaches
> -1 => true, and the write still occurs.
> 
> This patch changes postfix to prefix decrements in this and similar
> functions to prevent similar mistakes in the future. This decreases the
> iterations with one but the chosen loop count was arbitrary anyway.
> 
> In sunhv limit reaches -1, not 0, so the test is off by one.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>

Acked-by: David S. Miller <davem@...emloft.net>
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