linux-kernel - Re: [PATCH v1] i2c: tegra: Make timeout error more informative

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]

Message-ID: <20200310113706.GW1987@ninjato>
Date:   Tue, 10 Mar 2020 12:37:06 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] i2c: tegra: Make timeout error more informative

On Mon, Mar 02, 2020 at 08:35:12PM +0300, Dmitry Osipenko wrote:
> The I2C timeout error message doesn't tell us what exactly failed and some
> I2C client drivers do not clarify the error either. Adding WARN_ON_ONCE()
> results in a stacktrace being dumped into KMSG, which is very useful for
> debugging purposes.

This is good for debugging, in deed, yet not good in the generic case.
Timeouts are not an exception on the I2C bus (think of an EEPROM which
is busy during an erase cycle), so it shouldn't be printed at all.

This prinout should rather be dropped or at least be dev_dbg.


Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)