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

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Date:   Fri, 15 May 2020 09:26:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     "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>,
        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

On Thu, May 14, 2020 at 07:32:53PM -0700, Doug Anderson wrote:
> 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.

Now reviewed, nice catch.

greg k-h