linux-kernel - Re: [PATCH] leds: trigger: netdev: Fix kernel panic on interface rename trig notify

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Message-ID: <20240205150422.GC53266@google.com>
Date: Mon, 5 Feb 2024 15:04:22 +0000
From: Lee Jones <lee@...nel.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Pavel Machek <pavel@....cz>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Li Zetao <lizetao1@...wei.com>, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] leds: trigger: netdev: Fix kernel panic on interface
 rename trig notify

On Mon, 05 Feb 2024, Christian Marangi wrote:

> On Mon, Feb 05, 2024 at 02:33:59PM +0000, Lee Jones wrote:
> > On Mon, 05 Feb 2024, Christian Marangi wrote:
> > 
> > > On Mon, Feb 05, 2024 at 02:41:46PM +0100, Andrew Lunn wrote:
> > > > > > This should have 'net' in the subject line, to indicate which tree its
> > > > > > for.
> > > > > 
> > > > > No, it shouldn't.
> > > > > 
> > > > > Contributors aren't obliged to know anything about merging strategies.
> > > > 
> > > > With netdev, we tend to assume they do, or at least can contribute to
> > > > the discussion. They often know about any dependencies etc which could
> > > > influence the decision. When there are multiple subsystem maintainers
> > > > involved, i tend to use To: to indicate the maintainer i think should
> > > > merge the patch, and Cc: for the rest.
> > > >
> > > 
> > > I'm always a bit confused when I have to send patch to mixed subsystem
> > > (not the case but for net trigger it's almost that). Sorry for the
> > > confusion/noise.
> > 
> > When you have a truly cross-subsystem patch, it's up to you.
> > 
> >  - Mention both e.g. leds/net:
> >  - Mention neither e.g. <device>:
> >  - Mention the one that is most relevant
> > 
> >  An example of the last option might be when the lion's share of the
> >  changes occur in one subsystem and only header files are changed in the
> >  other.
> > 
> > In an ideal world i.e. when there are no build-time/runtime deps between
> > them, changes should be separated out into their own commits.
> >
> 
> Thanks a lot for the explaination and the examples!
> 
> > > > > Why does this need to go in via net?
> > > > 
> > > > It does not, as far as i'm aware. Christian, do you know of any
> > > > reason?
> > > > 
> > > 
> > > This is strictly a fix, no dependency or anything like that. Maybe using
> > > net as target would make this faster to merge (since net is for fix only
> > > and this has to be backported) than using leds-next?
> > 
> > We have leds-fixes for that.
> >
> 
> Oh! No idea, should I add a tag to the patch to target that branch
> specifically?

You don't need to do anything special.

The Fixes: tag is enough to let us know that this is a fix.

If the commit mentioned in Fixes: was accepted as part of the last
merge-window, it'll be sent to the -rcs in good time.  If it fixes a
commit which was introduced in a previous cycle, it'll be submitted
during the next merge-window.

> Anyway Since we have leds-fixes and this is leds related I think it's ok
> to use that and don't disturb net subsystem.

There is no reason why this should be merged via netdev.

> (again IT IS a kernel panic but happens only on some specific situation
> so it's not that critical)

-- 
Lee Jones [李琼斯]