diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2018-01-23 13:28:41 +0300 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2018-03-05 09:21:31 -0800 |
| commit | 17a0b9add6e954b0a6c0108775df6584886b3b21 (patch) | |
| tree | 13531abe87a1300e0f28151317316d78bc60ab72 | |
| parent | 1b8b062a99dc76ba55b3ded97e90717768da47a9 (diff) | |
igb: Do not call netif_device_detach() when PCIe link goes missing
When the driver notices that PCIe link is gone by reading 0xffffffff
from a register it clears hw->hw_addr and then calls netif_device_detach().
This happens when the PCIe device is physically unplugged for example
the user disconnected the Thunderbolt cable.
However, netif_device_detach() prevents netif_unregister() from bringing
the device down properly including tearing down MSI-X vectors. This
triggers following crash during the driver removal:
igb 0000:0b:00.0 enp11s0f0: PCIe link lost, device now detached
------------[ cut here ]------------
kernel BUG at drivers/pci/msi.c:352!
invalid opcode: 0000 [#1] PREEMPT SMP PTI
...
Call Trace:
pci_disable_msix+0xc9/0xf0
igb_reset_interrupt_capability+0x58/0x60 [igb]
igb_remove+0x90/0x100 [igb]
pci_device_remove+0x31/0xa0
device_release_driver_internal+0x152/0x210
pci_stop_bus_device+0x78/0xa0
pci_stop_bus_device+0x38/0xa0
pci_stop_bus_device+0x38/0xa0
pci_stop_bus_device+0x26/0xa0
pci_stop_bus_device+0x38/0xa0
pci_stop_and_remove_bus_device+0x9/0x20
trim_stale_devices+0xee/0x130
? _raw_spin_unlock_irqrestore+0xf/0x30
trim_stale_devices+0x8f/0x130
? _raw_spin_unlock_irqrestore+0xf/0x30
trim_stale_devices+0xa1/0x130
? get_slot_status+0x8b/0xc0
acpiphp_check_bridge.part.7+0xf9/0x140
acpiphp_hotplug_notify+0x170/0x1f0
...
To prevent the crash do not call netif_device_detach() in igb_rd32().
This should be fine because hw->hw_addr is set to NULL preventing future
hardware access of the now missing device.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=198181
Reported-by: Ferenc Boldog <ferenc.boldog@gmail.com>
Reported-by: Nikolay Bogoychev <nheart@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
| -rw-r--r-- | drivers/net/ethernet/intel/igb/igb_main.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 33f23ce99796..229b72aab17d 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -776,8 +776,7 @@ u32 igb_rd32(struct e1000_hw *hw, u32 reg) if (!(~value) && (!reg || !(~readl(hw_addr)))) { struct net_device *netdev = igb->netdev; hw->hw_addr = NULL; - netif_device_detach(netdev); - netdev_err(netdev, "PCIe link lost, device now detached\n"); + netdev_err(netdev, "PCIe link lost\n"); } return value; |