linux-kernel - Re: [PATCH net-next v1 21/21] net: dsa: Move devlink registration to be last devlink command

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Date:   Wed, 29 Sep 2021 16:07:49 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, Ariel Elior <aelior@...vell.com>,
        Bin Luo <luobin9@...wei.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Coiby Xu <coiby.xu@...il.com>,
        Derek Chickles <dchickles@...vell.com>,
        "drivers@...sando.io" <drivers@...sando.io>,
        Felix Manlunas <fmanlunas@...vell.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "GR-everest-linux-l2@...vell.com" <GR-everest-linux-l2@...vell.com>,
        "GR-Linux-NIC-Dev@...vell.com" <GR-Linux-NIC-Dev@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        Ido Schimmel <idosch@...dia.com>,
        Intel Corporation <linuxwwan@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
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        Jiri Pirko <jiri@...dia.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Linu Cherian <lcherian@...vell.com>,
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        Loic Poulain <loic.poulain@...aro.org>,
        Manish Chopra <manishc@...vell.com>,
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        Michael Chan <michael.chan@...adcom.com>,
        Michael Guralnik <michaelgur@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "oss-drivers@...igine.com" <oss-drivers@...igine.com>,
        Richard Cochran <richardcochran@...il.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Satanand Burla <sburla@...vell.com>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Shannon Nelson <snelson@...sando.io>,
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        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>,
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        Tariq Toukan <tariqt@...dia.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Vadym Kochan <vkochan@...vell.com>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH net-next v1 21/21] net: dsa: Move devlink registration to
 be last devlink command

On Wed, Sep 29, 2021 at 01:02:27PM +0000, Vladimir Oltean wrote:
> Hi Leon,
> 
> On Sat, Sep 25, 2021 at 02:23:01PM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...dia.com>
> >
> > This change prevents from users to access device before devlink
> > is fully configured.
> >
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> >  net/dsa/dsa2.c | 10 ++++------
> >  1 file changed, 4 insertions(+), 6 deletions(-)
> >
> > diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
> > index a020339e1973..8ca6a1170c9d 100644
> > --- a/net/dsa/dsa2.c
> > +++ b/net/dsa/dsa2.c
> > @@ -848,7 +848,6 @@ static int dsa_switch_setup(struct dsa_switch *ds)
> >  	dl_priv = devlink_priv(ds->devlink);
> >  	dl_priv->ds = ds;
> >
> > -	devlink_register(ds->devlink);
> >  	/* Setup devlink port instances now, so that the switch
> >  	 * setup() can register regions etc, against the ports
> >  	 */
> > @@ -874,8 +873,6 @@ static int dsa_switch_setup(struct dsa_switch *ds)
> >  	if (err)
> >  		goto teardown;
> >
> > -	devlink_params_publish(ds->devlink);
> > -
> >  	if (!ds->slave_mii_bus && ds->ops->phy_read) {
> >  		ds->slave_mii_bus = mdiobus_alloc();
> >  		if (!ds->slave_mii_bus) {
> > @@ -891,7 +888,7 @@ static int dsa_switch_setup(struct dsa_switch *ds)
> >  	}
> >
> >  	ds->setup = true;
> > -
> > +	devlink_register(ds->devlink);
> >  	return 0;
> >
> >  free_slave_mii_bus:
> > @@ -906,7 +903,6 @@ static int dsa_switch_setup(struct dsa_switch *ds)
> >  	list_for_each_entry(dp, &ds->dst->ports, list)
> >  		if (dp->ds == ds)
> >  			dsa_port_devlink_teardown(dp);
> > -	devlink_unregister(ds->devlink);
> >  	devlink_free(ds->devlink);
> >  	ds->devlink = NULL;
> >  	return err;
> > @@ -919,6 +915,9 @@ static void dsa_switch_teardown(struct dsa_switch *ds)
> >  	if (!ds->setup)
> >  		return;
> >
> > +	if (ds->devlink)
> > +		devlink_unregister(ds->devlink);
> > +
> >  	if (ds->slave_mii_bus && ds->ops->phy_read) {
> >  		mdiobus_unregister(ds->slave_mii_bus);
> >  		mdiobus_free(ds->slave_mii_bus);
> > @@ -934,7 +933,6 @@ static void dsa_switch_teardown(struct dsa_switch *ds)
> >  		list_for_each_entry(dp, &ds->dst->ports, list)
> >  			if (dp->ds == ds)
> >  				dsa_port_devlink_teardown(dp);
> > -		devlink_unregister(ds->devlink);
> >  		devlink_free(ds->devlink);
> >  		ds->devlink = NULL;
> >  	}
> > --
> > 2.31.1
> >
> 
> Sorry, I did not have time to review/test this change earlier.
> I now see this WARN_ON being triggered when I boot a board:

Sorry about that, it was missed in one of my rebases.
The fix was posted here.
https://lore.kernel.org/all/2ed1159291f2a589b013914f2b60d8172fc525c1.1632916329.git.leonro@nvidia.com

Thanks