linux-kernel - Re: I2C PM overhaul needed? (Re: [PATCH 1/2] i2c: sprd: Prevent i2c accesses after suspend is called)

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, 9 May 2018 17:18:48 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        Baolin Wang <baolin.wang@...aro.org>,
        linux-i2c@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: I2C PM overhaul needed? (Re: [PATCH 1/2] i2c: sprd: Prevent i2c
 accesses after suspend is called)

On Sat, May 05, 2018 at 10:32:55AM +0200, Wolfram Sang wrote:

> > OTOH it does mean we might not notice things happening later than they
> > should so it's not 100% clear...

> What do you mean here?

If someone is doing I/O later than they should currently we'll notice as
they try to do something that needs interrupts with interrupts disabled.
With transparent noirq then it'll just work on some percentage of
systems with controllers that support that but fail on others.  That may
or may not be what we want but it's worth considering.

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)