linux-kernel - Re: [PATCH 0/6] driver core: Fix some issues related to device links

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Date:   Fri, 25 Jan 2019 00:08:01 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
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>,
        Lukas Wunner <lukas@...ner.de>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH 0/6] driver core: Fix some issues related to device links

On Thu, Jan 24, 2019 at 3:58 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> On Thu, Jan 24, 2019 at 12:13:06PM +0100, Rafael J. Wysocki wrote:
> > Hi Greg at al,
> >
> > Recently I have been looking at the device links code because of the
> > recent discussion on possibly using them in the DRM subsystem (see for
> > example https://marc.info/?l=linux-pm&m=154832771905309&w=2) and I have
> > found a few issues in that code which should be addressed by this patch
> > series.  Please refer to the patch changelogs for details.
> >
> > None of the problems addressed here should be manifesting themselves in
> > mainline kernel today, but if there are more device links users in the
> > future, they most likely will be encountered sooner or later.  Also they
> > need to be fixed for the DRM use case to be supported IMO.
> >
> > This series does not fix all issues in device links that have become
> > apparent (generally speaking, the idea of returning an existing link
> > in case there is one already for the given consumer-supplier pair
> > doesn't play well with stateful links and their flags), so there will
> > be a follow-up series of patches to clean that up.  Still, I don't see
> > a reason to sit on these fixes while working on the other patches, so
> > here they go.
>
> Hi Rafael,
>
> I've just given these a quick boot, unbind and rebind test with my
> DRM case, and nothing seems to have regressed on the face of it.
>
> Tested-by: Russell King <rmk+kernel@...linux.org.uk>

Thank you!