linux-kernel - Re: [PATCH] serial: 8250_core: use pre-decrement for iteration limit

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Message-ID: <20141106183214.GA24232@kroah.com>
Date:	Thu, 6 Nov 2014 10:32:14 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Frans Klaver <frans.klaver@...ns.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250_core: use pre-decrement for iteration limit

On Tue, Oct 14, 2014 at 01:52:34PM +0200, Frans Klaver wrote:
> On Mon, Oct 13, 2014 at 05:09:11PM +0200, Frans Klaver wrote:
> > In serial8250_rx_chars(), max_count is set to 256. Due to the
> > post-decrement operator used in the while() condition, the maximum
> > number of iterations actually 257. This is not a problem, but it is
> > mildly surprising if you're debugging. Use pre-decrement instead.
> 
> I'm somewhat inclined to changing the title to something like:
> 
> serial: 8250_core: actually limit char reads to max_count

Sounds better, care to resend with that subject:?

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