linux-kernel - Re: [PATCH v2 4/9] driver core: Fix handling of runtime PM flags in device_link

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Date:   Thu, 7 Feb 2019 20:20:49 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Lucas Stach <l.stach@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2 4/9] driver core: Fix handling of runtime PM flags in device_link_add()

On Thu, Feb 7, 2019 at 8:15 PM Lukas Wunner <lukas@...ner.de> wrote:
>
> On Fri, Feb 01, 2019 at 01:49:14AM +0100, Rafael J. Wysocki wrote:
> > After commit ead18c23c263 ("driver core: Introduce device links
> > reference counting"), if there is a link between the given supplier
> > and the given consumer already, device_link_add() will refcount it
> > and return it unconditionally without updating its flags.  It is
> > possible, however, that the second (or any subsequent) caller of
> > device_link_add() for the same consumer-supplier pair will pass
> > DL_FLAG_PM_RUNTIME, possibly along with DL_FLAG_RPM_ACTIVE, in flags
> > to it and the existing link may not behave as expected then.
> [...]
> > Fixes: ead18c23c263 ("driver core: Introduce device links reference counting")
>
> I think this should be:
>
> Fixes: 21d5c57b3726 ("PM / runtime: Use device links")

Again, sorry for failing to look deeper into the past.

Yes, there should be

Fixes: 21d5c57b3726 ("PM / runtime: Use device links")

in the changelog of this patch, but again, I still would add the other
Fixes: tag too as the issue is still present after ead18c23c263 and
that commit is needed for the patch to apply.