linux-kernel - Re: Possible integer overflow in mach-bcmring with FPGA11107

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Date:	Mon, 23 Apr 2012 13:19:29 -0700
From:	"Jiandong Zheng" <jdzheng@...adcom.com>
To:	"Christian Dietrich" <dietrich@...fau.de>
cc:	"Scott Branden" <sbranden@...adcom.com>,
	"Russell King" <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	vamos-dev@...informatik.uni-erlangen.de
Subject: Re: Possible integer overflow in mach-bcmring with FPGA11107

On 4/23/2012 5:43 AM, Christian Dietrich wrote:
>
> This seems totally innocent, but when doing the caluculation for
> rate_hz by hand (or python) the result is slighly bigger than
> 2^32-1. Therfore an integer overflow should occur and the rate_hz rate
> will be far too low. It may be that there is a sanity check in
> hardware, but i don't know the used hardware at all.
>
Hi Christian,

Yes. This is a problem. I will cleanup fpga11107 code including this soon.

Thanks,
JD

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