Messages in this thread | | | From | "Pucha, HimasekharX Reddy" <> | Subject | RE: [Intel-wired-lan] [PATCH] igb: Fix igb_down hung on surprise removal | Date | Mon, 5 Jun 2023 04:47:49 +0000 |
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> -----Original Message----- > From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Ying Hsu > Sent: Thursday, May 18, 2023 12:57 PM > To: netdev@vger.kernel.org > Cc: grundler@chromium.org; intel-wired-lan@lists.osuosl.org; Ying Hsu <yinghsu@chromium.org>; Brandeburg, Jesse <jesse.brandeburg@intel.com>; linux-kernel@vger.kernel.org; Eric Dumazet <edumazet@google.com>; Nguyen, Anthony L <anthony.l.nguyen@intel.com>; Jakub Kicinski <kuba@kernel.org>; Paolo Abeni <pabeni@redhat.com>; David S. Miller <davem@davemloft.net> > Subject: [Intel-wired-lan] [PATCH] igb: Fix igb_down hung on surprise removal > > In a setup where a Thunderbolt hub connects to Ethernet and a display through USB Type-C, users may experience a hung task timeout when they remove the cable between the PC and the Thunderbolt hub. > This is because the igb_down function is called multiple times when the Thunderbolt hub is unplugged. For example, the igb_io_error_detected triggers the first call, and the igb_remove triggers the second call. > The second call to igb_down will block at napi_synchronize. > Here's the call trace: > __schedule+0x3b0/0xddb > ? __mod_timer+0x164/0x5d3 > schedule+0x44/0xa8 > schedule_timeout+0xb2/0x2a4 > ? run_local_timers+0x4e/0x4e > msleep+0x31/0x38 > igb_down+0x12c/0x22a [igb 6615058754948bfde0bf01429257eb59f13030d4] > __igb_close+0x6f/0x9c [igb 6615058754948bfde0bf01429257eb59f13030d4] > igb_close+0x23/0x2b [igb 6615058754948bfde0bf01429257eb59f13030d4] > __dev_close_many+0x95/0xec > dev_close_many+0x6e/0x103 > unregister_netdevice_many+0x105/0x5b1 > unregister_netdevice_queue+0xc2/0x10d > unregister_netdev+0x1c/0x23 > igb_remove+0xa7/0x11c [igb 6615058754948bfde0bf01429257eb59f13030d4] > pci_device_remove+0x3f/0x9c > device_release_driver_internal+0xfe/0x1b4 > pci_stop_bus_device+0x5b/0x7f > pci_stop_bus_device+0x30/0x7f > pci_stop_bus_device+0x30/0x7f > pci_stop_and_remove_bus_device+0x12/0x19 > pciehp_unconfigure_device+0x76/0xe9 > pciehp_disable_slot+0x6e/0x131 > pciehp_handle_presence_or_link_change+0x7a/0x3f7 > pciehp_ist+0xbe/0x194 > irq_thread_fn+0x22/0x4d > ? irq_thread+0x1fd/0x1fd > irq_thread+0x17b/0x1fd > ? irq_forced_thread_fn+0x5f/0x5f > kthread+0x142/0x153 > ? __irq_get_irqchip_state+0x46/0x46 > ? kthread_associate_blkcg+0x71/0x71 > ret_from_fork+0x1f/0x30 > > In this case, igb_io_error_detected detaches the network interface and requests a PCIE slot reset, however, the PCIE reset callback is not being invoked and thus the Ethernet connection breaks down. > As the PCIE error in this case is a non-fatal one, requesting a slot reset can be avoided. > This patch fixes the task hung issue and preserves Ethernet connection by ignoring non-fatal PCIE errors. > > Signed-off-by: Ying Hsu <yinghsu@chromium.org> > --- > This commit has been tested on a HP Elite Dragonfly Chromebook and a Caldigit TS3+ Thunderbolt hub. The Ethernet driver for the hub is igb. Non-fatal PCIE errors happen when users hot-plug the cables connected to the chromebook or to the external display. > > drivers/net/ethernet/intel/igb/igb_main.c | 5 +++++ > 1 file changed, 5 insertions(+) >
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
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