| Message ID | E1nj6FW-007WZB-5Y@rmk-PC.armlinux.org.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net-next] net: dsa: mt753x: fix pcs conversion regression | expand |
On 4/25/22 14:28, Russell King (Oracle) wrote: > Daniel Golle reports that the conversion of mt753x to phylink PCS caused > an oops as below. > > The problem is with the placement of the PCS initialisation, which > occurs after mt7531_setup() has been called. However, burited in this > function is a call to setup the CPU port, which requires the PCS > structure to be already setup. > > Fix this by changing the initialisation order. > > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 > Mem abort info: > ESR = 0x96000005 > EC = 0x25: DABT (current EL), IL = 32 bits > SET = 0, FnV = 0 > EA = 0, S1PTW = 0 > FSC = 0x05: level 1 translation fault > Data abort info: > ISV = 0, ISS = 0x00000005 > CM = 0, WnR = 0 > user pgtable: 4k pages, 39-bit VAs, pgdp=0000000046057000 > [0000000000000020] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 > Internal error: Oops: 96000005 [#1] SMP > Modules linked in: > CPU: 0 PID: 32 Comm: kworker/u4:1 Tainted: G S 5.18.0-rc3-next-20220422+ #0 > Hardware name: Bananapi BPI-R64 (DT) > Workqueue: events_unbound deferred_probe_work_func > pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : mt7531_cpu_port_config+0xcc/0x1b0 > lr : mt7531_cpu_port_config+0xc0/0x1b0 > sp : ffffffc008d5b980 > x29: ffffffc008d5b990 x28: ffffff80060562c8 x27: 00000000f805633b > x26: ffffff80001a8880 x25: 00000000000009c4 x24: 0000000000000016 > x23: ffffff8005eb6470 x22: 0000000000003600 x21: ffffff8006948080 > x20: 0000000000000000 x19: 0000000000000006 x18: 0000000000000000 > x17: 0000000000000001 x16: 0000000000000001 x15: 02963607fcee069e > x14: 0000000000000000 x13: 0000000000000030 x12: 0101010101010101 > x11: ffffffc037302000 x10: 0000000000000870 x9 : ffffffc008d5b800 > x8 : ffffff800028f950 x7 : 0000000000000001 x6 : 00000000662b3000 > x5 : 00000000000002f0 x4 : 0000000000000000 x3 : ffffff800028f080 > x2 : 0000000000000000 x1 : ffffff800028f080 x0 : 0000000000000000 > Call trace: > mt7531_cpu_port_config+0xcc/0x1b0 > mt753x_cpu_port_enable+0x24/0x1f0 > mt7531_setup+0x49c/0x5c0 > mt753x_setup+0x20/0x31c > dsa_register_switch+0x8bc/0x1020 > mt7530_probe+0x118/0x200 > mdio_probe+0x30/0x64 > really_probe.part.0+0x98/0x280 > __driver_probe_device+0x94/0x140 > driver_probe_device+0x40/0x114 > __device_attach_driver+0xb0/0x10c > bus_for_each_drv+0x64/0xa0 > __device_attach+0xa8/0x16c > device_initial_probe+0x10/0x20 > bus_probe_device+0x94/0x9c > deferred_probe_work_func+0x80/0xb4 > process_one_work+0x200/0x3a0 > worker_thread+0x260/0x4c0 > kthread+0xd4/0xe0 > ret_from_fork+0x10/0x20 > Code: 9409e911 937b7e60 8b0002a0 f9405800 (f9401005) > ---[ end trace 0000000000000000 ]--- > > Reported-by: Daniel Golle <daniel@makrotopia.org> > Tested-by: Daniel Golle <daniel@makrotopia.org> > Fixes: cbd1f243bc41 ("net: dsa: mt7530: partially convert to phylink_pcs") > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
On Mon, 25 Apr 2022 22:28:02 +0100 Russell King (Oracle) wrote: > Reported-by: Daniel Golle <daniel@makrotopia.org> > Tested-by: Daniel Golle <daniel@makrotopia.org> > Fixes: cbd1f243bc41 ("net: dsa: mt7530: partially convert to phylink_pcs") > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > --- > > Fixes line added so people know which net-next commit is affected; > this is only in net-next at present. If you think it's unnecessary, > please remove when applying the patch, or let me know and I will > resend. Not at all, FWIW it's very useful.
Hello: This patch was applied to netdev/net-next.git (master) by Jakub Kicinski <kuba@kernel.org>: On Mon, 25 Apr 2022 22:28:02 +0100 you wrote: > Daniel Golle reports that the conversion of mt753x to phylink PCS caused > an oops as below. > > The problem is with the placement of the PCS initialisation, which > occurs after mt7531_setup() has been called. However, burited in this > function is a call to setup the CPU port, which requires the PCS > structure to be already setup. > > [...] Here is the summary with links: - [net-next] net: dsa: mt753x: fix pcs conversion regression https://git.kernel.org/netdev/net-next/c/fae463084032 You are awesome, thank you!
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index c4ea73d996e8..e55d962fef9f 100644 --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -3035,9 +3035,16 @@ static int mt753x_setup(struct dsa_switch *ds) { struct mt7530_priv *priv = ds->priv; - int ret = priv->info->sw_setup(ds); - int i; + int i, ret; + + /* Initialise the PCS devices */ + for (i = 0; i < priv->ds->num_ports; i++) { + priv->pcs[i].pcs.ops = priv->info->pcs_ops; + priv->pcs[i].priv = priv; + priv->pcs[i].port = i; + } + ret = priv->info->sw_setup(ds); if (ret) return ret; @@ -3049,13 +3056,6 @@ mt753x_setup(struct dsa_switch *ds) if (ret && priv->irq) mt7530_free_irq_common(priv); - /* Initialise the PCS devices */ - for (i = 0; i < priv->ds->num_ports; i++) { - priv->pcs[i].pcs.ops = priv->info->pcs_ops; - priv->pcs[i].priv = priv; - priv->pcs[i].port = i; - } - return ret; }