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Miller" , Jakub Kicinski , Leon Romanovsky , Alexandre Belloni , Andrew Lunn , Ariel Elior , Bin Luo , Claudiu Manoil , Coiby Xu , Derek Chickles , "drivers@pensando.io" , Felix Manlunas , Florian Fainelli , Geetha sowjanya , Greg Kroah-Hartman , "GR-everest-linux-l2@marvell.com" , "GR-Linux-NIC-Dev@marvell.com" , hariprasad , Ido Schimmel , Intel Corporation , "intel-wired-lan@lists.osuosl.org" , Ioana Ciornei , Jerin Jacob , Jesse Brandeburg , Jiri Pirko , Jonathan Lemon , Linu Cherian , "linux-kernel@vger.kernel.org" , "linux-omap@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "linux-staging@lists.linux.dev" , Loic Poulain , Manish Chopra , M Chetan Kumar , Michael Chan , Michael Guralnik , "netdev@vger.kernel.org" , "oss-drivers@corigine.com" , Richard Cochran , Saeed Mahameed , Satanand Burla , Sergey Ryazanov , Shannon Nelson , Simon Horman , Subbaraya Sundeep , Sunil Goutham , Taras Chornyi , Tariq Toukan , Tony Nguyen , "UNGLinuxDriver@microchip.com" , Vadym Kochan , Vivien Didelot Subject: Re: [PATCH net-next v1 21/21] net: dsa: Move devlink registration to be last devlink command Thread-Topic: [PATCH net-next v1 21/21] net: dsa: Move devlink registration to be last devlink command Thread-Index: AQHXsf/jDUQggLoXsECBC/w3h2dcLKu7AIAA Date: Wed, 29 Sep 2021 13:02:27 +0000 Message-ID: <20210929130226.j53fcztm6utpt3tu@skbuf> References: <66dd7979b44ac307711c382054f428f9287666a8.1632565508.git.leonro@nvidia.com> In-Reply-To: <66dd7979b44ac307711c382054f428f9287666a8.1632565508.git.leonro@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: kernel.org; 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charset="us-ascii" Content-ID: <59CDFF54EC25CA4CA449F68A8083757C@eurprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5136.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e64c117f-2173-4cc4-7163-08d983496375 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Sep 2021 13:02:27.3218 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: GuQXl14czK/MVPcyn80p2iOMorfZ7brQSmRu34Gz6z3YMg42XEQEYAoCTqhP51r08KCSbVjsnNEcos7S/9FWHQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB6270 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Leon, On Sat, Sep 25, 2021 at 02:23:01PM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky > > This change prevents from users to access device before devlink > is fully configured. > > Signed-off-by: Leon Romanovsky > --- > 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 =3D devlink_priv(ds->devlink); > dl_priv->ds =3D 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 =3D mdiobus_alloc(); > if (!ds->slave_mii_bus) { > @@ -891,7 +888,7 @@ static int dsa_switch_setup(struct dsa_switch *ds) > } > > ds->setup =3D 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 =3D=3D ds) > dsa_port_devlink_teardown(dp); > - devlink_unregister(ds->devlink); > devlink_free(ds->devlink); > ds->devlink =3D 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 =3D=3D ds) > dsa_port_devlink_teardown(dp); > - devlink_unregister(ds->devlink); > devlink_free(ds->devlink); > ds->devlink =3D 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: [ 6.731180] WARNING: CPU: 1 PID: 79 at net/core/devlink.c:5158 devlink_n= l_region_notify+0xa8/0xc0 [ 6.740123] Modules linked in: [ 6.743217] CPU: 1 PID: 79 Comm: kworker/u4:2 Tainted: G W = 5.15.0-rc2-07010-ga9b9500ffaac-dirty #876 [ 6.759155] Workqueue: events_unbound deferred_probe_work_func [ 6.765048] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE= =3D--) [ 6.772060] pc : devlink_nl_region_notify+0xa8/0xc0 [ 6.776978] lr : devlink_nl_region_notify+0x3c/0xc0 [ 6.781893] sp : ffff8000108b38b0 [ 6.785235] x29: ffff8000108b38b0 x28: ffff6fce86e53780 x27: ffff6fce86e= 525c8 [ 6.792453] x26: ffff6fce86e69b00 x25: ffff6fce86e57600 x24: 00000000000= 17528 [ 6.799668] x23: 0000000000000001 x22: ffff6fce86e57400 x21: 00000000000= 0002c [ 6.806883] x20: 0000000000000000 x19: ffff6fce86e69b00 x18: 00000000fff= ffff8 [ 6.814098] x17: 000000000000013f x16: 000000000000017f x15: fffffffffff= fffff [ 6.821313] x14: ffffff0000000000 x13: ffffffffffffffff x12: 00000000000= 0000b [ 6.828528] x11: ffffc1141c2fce38 x10: 0000000000000005 x9 : 659dd6f9176= 4a956 [ 6.835742] x8 : ffff6fce851ce100 x7 : ffffc1141c6bf000 x6 : 00000000302= 0805e [ 6.842956] x5 : 00ffffffffffffff x4 : ffffaebaddb5a000 x3 : 00000000000= 00000 [ 6.850169] x2 : 0000000000000000 x1 : ffff6fce851ce100 x0 : 00000000000= 00000 [ 6.857383] Call trace: [ 6.859854] devlink_nl_region_notify+0xa8/0xc0 [ 6.864422] devlink_region_create+0x110/0x150 [ 6.868902] dsa_devlink_region_create+0x14/0x20 [ 6.873563] sja1105_devlink_setup+0x54/0xa0 [ 6.877871] sja1105_setup+0x144/0x1390 [ 6.881742] dsa_register_switch+0x978/0x1010 [ 6.886139] sja1105_probe+0x628/0x644 [ 6.889920] spi_probe+0x84/0xe4 [ 6.893180] really_probe.part.0+0x9c/0x31c [ 6.897402] __driver_probe_device+0x98/0x144 [ 6.901797] driver_probe_device+0xc8/0x160 [ 6.906019] __device_attach_driver+0xb8/0x120 [ 6.910501] bus_for_each_drv+0x78/0xd0 [ 6.914373] __device_attach+0xd8/0x180 [ 6.918243] device_initial_probe+0x14/0x20 [ 6.922466] bus_probe_device+0x9c/0xa4 [ 6.926337] deferred_probe_work_func+0x88/0xc4 [ 6.930906] process_one_work+0x288/0x6f0 [ 6.934952] worker_thread+0x74/0x470 [ 6.938646] kthread+0x160/0x170 [ 6.941909] ret_from_fork+0x10/0x20 [ 6.945519] irq event stamp: 64656=