linux-kernel - Re: [PATCH v6 3/5] kernel/cpu_pm: Fix uninitted local in cpu

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Date:   Thu, 14 May 2020 19:32:53 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Evan Green <evgreen@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Maulik Shah <mkshah@...eaurora.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Colin Cross <ccross@...roid.com>,
        Kevin Hilman <khilman@...com>,
        Santosh Shilimkar <santosh.shilimkar@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 3/5] kernel/cpu_pm: Fix uninitted local in cpu_pm

Hi,

On Mon, May 4, 2020 at 10:50 AM Douglas Anderson <dianders@...omium.org> wrote:
>
> 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>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> ---
> This seems to be an ownerless file.  I'm hoping this patch can just go
> through the Qualcomm tree.  It would be nice if we could get an Ack
> from Rafael or Greg KH though.

Greg / Rafael: any thoughts on this patch?  Care to give it an Ack so
it could go through the Qualcomm tree?

Andrew: I think you are the adopter or orphan patches, usually.  If
nobody else will take this patch, will you consider taking it into
your tree?  It should be a super straightforward bugfix.  I'm happy to
re-post it CCing you if need be.

Thanks!

-Doug