From 17a0b9add6e954b0a6c0108775df6584886b3b21 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 23 Jan 2018 13:28:41 +0300 Subject: 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 Reported-by: Nikolay Bogoychev Signed-off-by: Mika Westerberg Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/igb/igb_main.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/net/ethernet/intel/igb') 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; -- cgit v1.2.3-59-g8ed1b