From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Roel Kluin <roel.kluin@gmail.com>
Cc: davem@davemloft.net, lkml <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] serial: off by one
Date: Thu, 4 Jun 2009 13:04:23 +0100 (WEST) [thread overview]
Message-ID: <alpine.LFD.1.10.0906041303510.332@ftp.linux-mips.org> (raw)
In-Reply-To: <4A270541.4050900@gmail.com>
On Thu, 4 Jun 2009, Roel Kluin wrote:
> 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@gmail.com>
Acked-by: Maciej W. Rozycki <macro@linux-mips.org>
Maciej
prev parent reply other threads:[~2009-06-04 12:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-03 23:20 [PATCH] serial: off by one Roel Kluin
2009-06-04 4:18 ` David Miller
2009-06-04 12:04 ` Maciej W. Rozycki [this message]
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