linux-kernel - Re: [PATCH] opp: Fix dev_pm_opp_set

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:   Tue, 11 Aug 2020 10:12:49 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        viresh.kumar@...aro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] opp: Fix dev_pm_opp_set_rate() to not return early

On Mon, Aug 10, 2020 at 12:36:19PM +0530, Rajendra Nayak wrote:
> dev_pm_opp_set_rate() can now be called with freq = 0 inorder
> to either drop performance or bandwidth votes or to disable
> regulators on platforms which support them.
> In such cases, a subsequent call to dev_pm_opp_set_rate() with
> the same frequency ends up returning early because 'old_freq == freq'
> Instead make it fall through and put back the dropped performance
> and bandwidth votes and/or enable back the regulators.
> 
> Fixes: cd7ea582 ("opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes")
> Reported-by: Sajida Bhanu <sbhanu@...eaurora.org>
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>

Tested-by: Matthias Kaehlcke <mka@...omium.org>

Originally-reported-by: Matthias Kaehlcke <mka@...omium.org>
  https://patchwork.kernel.org/patch/11675369/#23514895 :P