linux-kernel - Re: [PATCH v1 09/15] platform/x86: i2c-multi-instantiate: Count I2cSerialBus() resources

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Date:   Mon, 26 Nov 2018 16:32:45 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 09/15] platform/x86: i2c-multi-instantiate: Count
 I2cSerialBus() resources

On Wed, Nov 21, 2018 at 01:03:35PM +0100, Hans de Goede wrote:
> On 20-11-18 16:59, Andy Shevchenko wrote:

> > -	multi->num_clients = i;
> > +	multi->num_clients = ret;
> >   	for (i = 0; i < multi->num_clients; i++) {
> >   		memset(&board_info, 0, sizeof(board_info));
> 
> Now you end up indexing inst_data with i without checking that inst_data
> holds enough data. Not using all of inst_data in case there are less
> I2cSerialBus resources then inst_data entries is fine. But you need to
> deal with the case when there are more I2cSerialBus resources then inst_data
> entries, either by erroring out or ignoring the extra I2cSerialBus resources.

I think returning an error here is to be on safer side.

> Also it might be better to make the i2c_multi_inst_count_resources() function
> a generic helper under drivers/acpi, so that it can be used in other places,
> see my comments to the BOSC0200 patch.

I would rather to avoid touching BOSC0200 right now and keep that function
inside i2c-multi-instantiate.


-- 
With Best Regards,
Andy Shevchenko