linux-kernel - Re: [PATCH] regmap: mmio: Fix the bug of 'offset' value parsing.

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Message-ID: <20140401123822.GW2269@sirena.org.uk>
Date:	Tue, 1 Apr 2014 13:38:22 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Xiubo Li <Li.Xiubo@...escale.com>
Cc:	linux@...ck-us.net, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap: mmio: Fix the bug of 'offset' value parsing.

On Mon, Mar 31, 2014 at 02:33:31PM +0800, Xiubo Li wrote:
> 'offset = *(u32 *)reg;', this will be okey for 32/64-bit register, but
> for 8/16-bit register, the 'offset' value will overflow.

This doesn't apply against regmap-v3.15, please check and resend.

> The core trace:
> ===============
> Unable to handle kernel paging request at virtual address ffbd0000
> pgd = 871e8000
> [ffbd0000] *pgd=00000000
> Internal error: Oops: 805 [#1] ARM
> Modules linked in:
> CPU: 0 PID: 1004 Comm: sh Not tainted 3.14.0-rc6+ #990
> task: 871baa40 ti: 87090000 task.ti: 87090000

Don't paste entire backtraces into commit messages, they're enormous and
most of the detail isn't useful making it easy to miss relevant
information - either pick relevant sections or just describe the
failure.

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