linux-kernel - Re: [PATCH] i2c: exynos5: Preserve high speed master code

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, 17 Feb 2021 09:07:47 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marten Lindahl <martenli@...s.com>
Cc:     linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...s.com
Subject: Re: [PATCH] i2c: exynos5: Preserve high speed master code

On Tue, Feb 16, 2021 at 11:09:33PM +0100, Marten Lindahl wrote:
> > Any reason why not "|= MASTER_ID(i2c->adap.nr)" here instead of more
> > expensive IO read? It's quite important because your current code will
> > bitwise-or old I2C slave address with a new one... This should break
> > during tests with multiple I2C slave devices, shouldn't it?
> > 
> 
> You are correct. It is better to use the macro instead, and yes,
> safer too. I only have one device that supports high speed i2c, but
> I get your point. It could potentially break.
> 
> > On which HW did you test it?
> 
> I used an Artpec development board as master and INA230EVM board
> as slave.

Artpec development board with? What SoC?

Best regards,
Krzysztof