linux-kernel - Re: [PATCH v1] serdev: Set fwnode for serdev devices

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Date:   Mon, 6 Mar 2023 20:47:48 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, kernel-team@...roid.com,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] serdev: Set fwnode for serdev devices

On Thu, Mar 2, 2023 at 10:07 AM Saravana Kannan <saravanak@...gle.com> wrote:
>
> On Thu, Mar 2, 2023 at 9:51 AM Florian Fainelli <f.fainelli@...il.com> wrote:
> >
> >
> >
> > On 3/2/2023 9:20 AM, Saravana Kannan wrote:
> > > On Thu, Mar 2, 2023 at 9:01 AM Stefan Wahren <stefan.wahren@...e.com> wrote:
> > >>
> > >> Hi Saravana,
> > >>
> > >> Am 02.03.23 um 03:35 schrieb Saravana Kannan:
> > >>> This allow fw_devlink to do dependency tracking for serdev devices.
> > >>>
> > >>> Reported-by: Florian Fainelli <f.fainelli@...il.com>
> > >>> Link: https://lore.kernel.org/lkml/03b70a8a-0591-f28b-a567-9d2f736f17e5@gmail.com/
> > >>> Cc: Stefan Wahren <stefan.wahren@...e.com>
> > >>> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> > >>
> > >> since this fixes an issue on Raspberry Pi 4, shouldn't this be mentioned
> > >> in the commit message and providing a Fixes tag?
> > >
> > > So RPi 4 was never creating a device links between serdev devices and
> > > their consumers. The error message was just a new one I added and we
> > > are noticing and catching the fact that serdev wasn't setting fwnode
> > > for a device.
> > >
> > > I'm also not sure if I can say this commit "Fixes" an issue in serdev
> > > core because when serdev core was written, fw_devlink wasn't a thing.
> > > Once I add Fixes, people will start pulling this into stable
> > > branches/other trees where I don't think this should be pulled into
> > > older stable branches.
> >
> > That is kind of the point of Fixes: tag, is not it? It is appropriate to
> > list a commit that is not specific to serdev, but maybe a particular
> > point into the fw_devlink history.
>
> I don't want to pick an arbitrary point in fw_devlink as I don't want
> people picking this up with some old version of fw_devlink and having
> to support it there.
>
> > Given this did not appear to have a
> > functional impact, we could go without one.
>
> This is my take too.
>
> Greg/Rob,
>
> If you really want a Fixes here, can you please just add it instead of
> a v2 patch just for that? You can use this commit:
> 3fb16866b51d driver core: fw_devlink: Make cycle detection more robust

Rob/Greg,

Can you pick this up for 6.3-rc2 please?

-Saravana