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

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Message-ID: <CAJZ5v0hbUahUbExUMY6-A2DZ6AK2aXh00UTTaiRvtPW9RBVeVg@mail.gmail.com>
Date:   Thu, 31 Jan 2019 19:36:18 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.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>,
        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>
Subject: Re: [PATCH 0/6] driver core: Fix some issues related to device links

On Thu, Jan 31, 2019 at 7:24 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Thu, Jan 31, 2019 at 05:02:05PM +0100, Rafael J. Wysocki wrote:
> > On Thu, Jan 31, 2019 at 2:24 PM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > >
> > > On Thu, Jan 31, 2019 at 02:22:47PM +0100, Greg Kroah-Hartman wrote:
> > > > On Thu, Jan 31, 2019 at 11:09:51AM +0100, Rafael J. Wysocki wrote:
> > > > > On Thu, Jan 24, 2019 at 12:25 PM Rafael J. Wysocki <rjw@...ysocki.net> 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.
> > > > >
> > > > > Any concerns regarding this lot?
> > > > >
> > > > > [Please note that patch 5 in the series was replaced with the v2 at
> > > > > https://patchwork.kernel.org/patch/10781205/]
> > > > >
> > > > > If not, and if you don't mind, I would like to queue it up next week,
> > > > > possibly along with the follow-up material posted on Monday
> > > > > (https://lore.kernel.org/lkml/2405639.4es7pRLqn0@aspire.rjw.lan/) if
> > > > > that is not problematic, so it gets some linux-next coverage before
> > > > > the next merge window.
> > > >
> > > > Can I queue it up in my tree, given that I have a number of other driver
> > > > core patches in there, and I don't know how the merge issues will be if
> > > > we start to diverge.
> > > >
> > > > Or do you need this for some other work?
> > >
> > > To make this clearer, I have no objection to take this through my tree
> > > now, along with your second set of patches.  Is that ok?
> >
> > Yes, it is, AFAICS.  Thank you!
> >
> > Do you need me to resend all of this as one series?
>
> Yes, can you please do that.  Also, can you rebase it against my
> driver-core-next branch as right now, patch 1/6 has conflicts due to
> other patches that are in my tree :(

I'll do that, thanks!

Cheers,
Rafael