linux-kernel - Re: [PATCH] i2c: piix4: Fix request

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Date:   Sat, 28 Jan 2017 12:13:46 +0100
From:   Jean Delvare <jdelvare@...e.de>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: piix4: Fix request_region size

Hi Wolfram,

On Sat, 28 Jan 2017 12:00:21 +0100, Wolfram Sang wrote:
> 
> > >  /* count for request_region */
> > > -#define SMBIOSIZE	8
> > > +#define SMBIOSIZE	9
> > 
> > Are you certain that all supported devices have this extra register?
> 
> Isn't it better to have a potentially unused register mapped than a
> potentially used register unmapped?

My concern is that the region request could fail due to a conflict with
another device, if the physical I/O region is only 8 and we try to
request 9.

-- 
Jean Delvare
SUSE L3 Support