linux-kernel - Re: [PATCH] regulator: core: Use ktime_get_boottime() to determine how long a regulator was off

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 for Android: free password hash cracker in your pocket

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

Message-ID: <CAE-0n51P-nXPKmcN9K5RtdFJh5EQ3M_hm2LjBicfegWKUda2Dw@mail.gmail.com>
Date:   Wed, 22 Feb 2023 15:46:39 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: core: Use ktime_get_boottime() to determine
 how long a regulator was off

Quoting Matthias Kaehlcke (2023-02-22 11:15:46)
> For regulators with 'off-on-delay-us' the regulator framework currently
> uses ktime_get() to determine how long the regulator has been off
> before re-enabling it (after a delay if needed). A problem with using
> ktime_get() is that it doesn't account for the time the system is
> suspended. As a result a regulator with a longer 'off-on-delay' (e.g.
> 500ms) that was switched off during suspend might still incurr in a
> delay on resume before it is re-enabled, even though the regulator
> might have been off for hours. ktime_get_boottime() accounts for
> suspend time, use it instead of ktime_get().
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---

Is it fixing something in stable kernels? Should it be tagged for
stable?

Reviewed-by: Stephen Boyd <swboyd@...omium.org>