linux-kernel - Re: [PATCH v4 3/5] kernel/cpu_pm: Fix uninitted local in cpu

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Message-ID: <158769623054.135303.13351246588453753133@swboyd.mtv.corp.google.com>
Date:   Thu, 23 Apr 2020 19:43:50 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rafael.j.wysocki@...el.com
Cc:     mka@...omium.org, mkshah@...eaurora.org, evgreen@...omium.org,
        Douglas Anderson <dianders@...omium.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Allison Randal <allison@...utok.net>,
        Colin Cross <ccross@...roid.com>,
        Kevin Hilman <khilman@...com>,
        Santosh Shilimkar <santosh.shilimkar@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/5] kernel/cpu_pm: Fix uninitted local in cpu_pm

Quoting Douglas Anderson (2020-04-22 14:55:01)
> cpu_pm_notify() is basically a wrapper of notifier_call_chain().
> notifier_call_chain() doesn't initialize *nr_calls to 0 before it
> starts incrementing it--presumably it's up to the callers to do this.
> 
> Unfortunately the callers of cpu_pm_notify() don't init *nr_calls.
> This potentially means you could get too many or two few calls to
> CPU_PM_ENTER_FAILED or CPU_CLUSTER_PM_ENTER_FAILED depending on the
> luck of the stack.
> 
> Let's fix this.
> 
> Fixes: ab10023e0088 ("cpu_pm: Add cpu power management notifiers")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

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