linux-kernel - Re: [PATCH v2] driver core: Extend device_is

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Date:   Tue, 19 Jan 2021 16:21:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Saravana Kannan <saravanak@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v2] driver core: Extend device_is_dependent()

On Tue, Jan 19, 2021 at 04:09:14PM +0100, Rafael J. Wysocki wrote:
> On Fri, Jan 15, 2021 at 7:31 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> >
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > If the device passed as the target (second argument) to
> > device_is_dependent() is not completely registered (that is, it has
> > been initialized, but not added yet), but the parent pointer of it
> > is set, it may be missing from the list of the parent's children
> > and device_for_each_child() called by device_is_dependent() cannot
> > be relied on to catch that dependency.
> >
> > For this reason, modify device_is_dependent() to check the ancestors
> > of the target device by following its parent pointer in addition to
> > the device_for_each_child() walk.
> >
> > Fixes: 9ed9895370ae ("driver core: Functional dependencies tracking support")
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Reported-by: Stephan Gerhold <stephan@...hold.net>
> > Tested-by: Stephan Gerhold <stephan@...hold.net>
> 
> Greg, are you going to pick up this one or do you want me to take care of it?
> 
> It has been reviewed by Saravana.

I'll take it, thanks.  sorry for the delay.

greg k-h