linux-kernel - Re: [PATCH v9 6/8] drivers:input:ads7846(+tsc2046): fix spi module table

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 1 Feb 2017 19:50:16 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Mark Rutland <mark.rutland@....com>,
        Michel Verlaan <michel.verl@...il.com>,
        Nick Dyer <nick@...anahar.org>,
        Tony Lindgren <tony@...mide.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-omap <linux-omap@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Igor Grinberg <grinberg@...pulab.co.il>,
        Hans Verkuil <hans.verkuil@...co.com>,
        linux-input@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Eric Engestrom <eric@...estrom.ch>,
        Hans de Goede <hdegoede@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Petr Cvek <petr.cvek@....cz>,
        Siebren Vroegindeweij <siebren.vroegindeweij@...mail.com>,
        Sebastian Reichel <sre@...nel.org>, linux-iio@...r.kernel.org,
        "Andrew F. Davis" <afd@...com>, Mark Brown <broonie@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>,
        kernel@...a-handheld.com, Michael Welling <mwelling@...e.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [PATCH v9 6/8] drivers:input:ads7846(+tsc2046): fix spi module
 table

Hello Dmitry,

On 02/01/2017 07:28 PM, Dmitry Torokhov wrote:

[snip]

>>
>> As said, changing the core is trivial. A RFC patch is [0].
>>
>> The problem is how to make sure that this change won't cause regressions
>> in existing drivers.
> 
> If the concern with drivers having I2C or SPI device table, but not OF
> device table, then I think cocinnelle could be used to scan and find
> them.
>

I don't think coccinelle is a good fit for this since you may have to look if
a DTS is using in its compatible string a device that's in an SPI table or if
a DT binding documents this device as a compatible string.

But yes I get your point and I agree that is just a matter of having a script
to look for these. Someone should have the time to write it though :)

>>
>> There was particularly tricky for the spi-nor driver, it doesn't help that
>> a lot of DT are using undocumented compatible strings (sometimes with no
>> vendor prefix). You can see the discussion here [1].
>>
>> In the same thread Mark Brown said that it wasn't that bad to have the
>> information in the OF device ID table duplicated in a SPI device table.
>>
>> Certainly isn't the best approach but IMHO is better than the module not
>> loading.
> 
> You can always build the module into kernel or load it by hand if it is
> that important. Module autoloading does not work anyway if you have
> several compatible strings, like
> 
> 	compatible = "vendor,new-device", "vendor,generic-device";
> 
> Thanks.
>

Agree.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America