Unhandled fault during system suspend in sky2_shutdown

From: Sudeep Holla
Date: Mon Apr 11 2016 - 12:24:45 EST


Hi,

I am seeing unhandled fault during system suspend in sky2_shutdown.
I am not sure if it's something missing in the firmware, but just wanted
to check. I see that networkmanager is invoking calling to netlink_sendmsg which calls sky2_get_stats after the device is shutdown.

Unhandled fault: synchronous external abort (0x96000210) at 0xffff0000091c2918
Internal error: : 96000210 [#1] PREEMPT SMP
Modules linked in:
CPU: 3 PID: 2029 Comm: NetworkManager Not tainted 4.6.0-rc3 #126
Hardware name: ARM Juno development board (r2) (DT)
task: ffff80007a673000 ti: ffff800940b5c000 task.ti: ffff800940b5c000
PC is at sky2_get_stats+0x44/0x3b8
LR is at dev_get_stats+0x58/0xc8
sky2_get_stats+0x44/0x3b8
rtnl_fill_stats+0x20/0x138
rtnl_fill_ifinfo+0x440/0xb38
rtnl_getlink+0xe8/0x198
rtnetlink_rcv_msg+0xe4/0x220
netlink_rcv_skb+0xc4/0xf8
rtnetlink_rcv+0x2c/0x40
netlink_unicast+0x160/0x238
netlink_sendmsg+0x2f0/0x358
sock_sendmsg+0x18/0x30
___sys_sendmsg+0x204/0x218
__sys_sendmsg+0x44/0x88
SyS_sendmsg+0xc/0x18
el0_svc_naked+0x24/0x28

The below patch is the hack I came up to check if the netdev is detached and unregistered, I no longer see the issue.

Regards,
Sudeep

-->8

diff --git i/drivers/net/ethernet/marvell/sky2.c w/drivers/net/ethernet/marvell/sky2.c
index ec0a22119e09..0ff0434e32fc 100644
--- i/drivers/net/ethernet/marvell/sky2.c
+++ w/drivers/net/ethernet/marvell/sky2.c
@@ -5220,6 +5220,13 @@ static SIMPLE_DEV_PM_OPS(sky2_pm_ops, sky2_suspend, sky2_resume);

static void sky2_shutdown(struct pci_dev *pdev)
{
+ struct sky2_hw *hw = pci_get_drvdata(pdev);
+ int i;
+
+ for (i = hw->ports - 1; i >= 0; --i) {
+ sky2_detach(hw->dev[i]);
+ unregister_netdev(hw->dev[i]);
+ }
sky2_suspend(&pdev->dev);
pci_wake_from_d3(pdev, device_may_wakeup(&pdev->dev));
pci_set_power_state(pdev, PCI_D3hot);