[3.5.1] tg3 waitqueue hang on hotplug remove...

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Hi Matt, Michael,

On my Macbook Retina with 3.5.1, I see the tg3 external adapter (via
Thunderbolt) get logically disconnected after a while despite
remaining connected (Thunderbolt issues).

The problem is though, that the pciehp_wq workqueue fails to complete
flushing from the call to pcie_cleanup_slot (inlined in
pciehp_release_ctrl) [1]; looks like tg3_tx or so is missing a
finish_wait(), no?

Daniel

--- [1]

pcieport 0000:00:01.0: irq 42 for MSI/MSI-X
pcieport 0000:00:01.1: irq 43 for MSI/MSI-X
pcieport 0000:00:01.2: irq 44 for MSI/MSI-X
pcieport 0000:05:00.0: irq 45 for MSI/MSI-X
pcieport 0000:06:00.0: irq 46 for MSI/MSI-X
pcieport 0000:06:03.0: irq 47 for MSI/MSI-X
pcieport 0000:06:04.0: irq 48 for MSI/MSI-X
pcieport 0000:06:05.0: irq 49 for MSI/MSI-X
pcieport 0000:06:06.0: irq 50 for MSI/MSI-X
pcieport 0000:08:00.0: irq 51 for MSI/MSI-X
pcieport 0000:09:00.0: irq 52 for MSI/MSI-X
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
pciehp 0000:06:00.0:pcie24: HPC vendor_id 8086 device_id 1547 ss_vid
2222 ss_did 1111
pciehp 0000:06:00.0:pcie24: service driver pciehp loaded
pciehp 0000:06:03.0:pcie24: HPC vendor_id 8086 device_id 1547 ss_vid
2222 ss_did 1111
pciehp 0000:06:03.0:pcie24: service driver pciehp loaded
pciehp 0000:06:04.0:pcie24: HPC vendor_id 8086 device_id 1547 ss_vid
2222 ss_did 1111
pciehp 0000:06:04.0:pcie24: service driver pciehp loaded
pciehp 0000:06:05.0:pcie24: HPC vendor_id 8086 device_id 1547 ss_vid
2222 ss_did 1111
pciehp 0000:06:05.0:pcie24: service driver pciehp loaded
pciehp 0000:06:06.0:pcie24: HPC vendor_id 8086 device_id 1547 ss_vid
2222 ss_did 1111
pciehp 0000:06:06.0:pcie24: service driver pciehp loaded
pciehp 0000:09:00.0:pcie24: HPC vendor_id 8086 device_id 1549 ss_vid 0 ss_did 0
pciehp 0000:09:00.0:pcie24: service driver pciehp loaded
pciehp: PCI Express Hot Plug Controller Driver version: 0.4
tg3 0000:0a:00.0: eth0: Tigon3 [partno(BCM957762) rev 57766000] (PCI
Express) MAC address 40:6c:8f:36:1a:67
tg3 0000:0a:00.0: eth0: attached PHY is 57765 (10/100/1000Base-T
Ethernet) (WireSpeed[1], EEE[0])
tg3 0000:0a:00.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
tg3 0000:0a:00.0: eth0: dma_rwctrl[00000001] dma_mask[64-bit]
...
pciehp 0000:06:03.0:pcie24: Card not present on Slot(3)
tg3 0000:0a:00.0: tg3_abort_hw timed out, TX_MODE_ENABLE will not
clear MAC_TX_MODE=ffffffff
tg3 0000:0a:00.0: eth1: No firmware running
tg3 0000:0a:00.0: eth1: Link is down
[sched_delayed] sched: RT throttling activated
pciehp 0000:09:00.0:pcie24: unloading service driver pciehp
INFO: task kworker/0:2:3072 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:2   D ffffffff8180cc20   0 3072   2 0x00000000
 ffff880237f75800 0000000000000046 0000000000000001 ffff880237f757b0
 ffff880237f75fd8 ffff880237f75fd8 ffff880237f75fd8 0000000000013940
 ffff88025f3b5c00 ffff880237eb5c00 0000000000000000 7fffffffffffffff
Call Trace:
 [<ffffffff816966e9>] schedule+0x29/0x70
 [<ffffffff81694e05>] schedule_timeout+0x2a5/0x320
 [<ffffffff81040af9>] ? default_spin_lock_flags+0x9/0x10
 [<ffffffff811ee0f9>] ? pde_put+0x79/0xa0
 [<ffffffff8169653f>] wait_for_common+0xdf/0x180
 [<ffffffff811ee0f9>] ? pde_put+0x79/0xa0
 [<ffffffff8108a360>] ? try_to_wake_up+0x200/0x200
 [<ffffffff816966bd>] wait_for_completion+0x1d/0x20
 [<ffffffff81070ec3>] flush_workqueue+0x143/0x400
 [<ffffffff8136d600>] ? pciehp_disable_slot+0x1f0/0x1f0
 [<ffffffff8136f986>] pciehp_release_ctrl+0x46/0xa0
 [<ffffffff8136c037>] pciehp_remove+0x27/0x30
 [<ffffffff81365167>] pcie_port_remove_service+0x57/0x70
 [<ffffffff81423abc>] __device_release_driver+0x7c/0xe0
 [<ffffffff81423b4c>] device_release_driver+0x2c/0x40
 [<ffffffff81423551>] bus_remove_device+0xe1/0x120
 [<ffffffff81365480>] ? resume_iter+0x40/0x40
 [<ffffffff81420d60>] device_del+0x120/0x1b0
 [<ffffffff81365480>] ? resume_iter+0x40/0x40
 [<ffffffff81420e06>] device_unregister+0x16/0x30
 [<ffffffff813654bd>] remove_iter+0x3d/0x50
 [<ffffffff8141fe64>] device_for_each_child+0x44/0x70
 [<ffffffff81365a16>] pcie_port_device_remove+0x26/0x40
 [<ffffffff81365b56>] pcie_portdrv_remove+0x16/0x30
 [<ffffffff8135e426>] pci_device_remove+0x46/0x110
 [<ffffffff81423abc>] __device_release_driver+0x7c/0xe0
 [<ffffffff81423b4c>] device_release_driver+0x2c/0x40
 [<ffffffff81423551>] bus_remove_device+0xe1/0x120
 [<ffffffff81420d60>] device_del+0x120/0x1b0
 [<ffffffff81420e06>] device_unregister+0x16/0x30
 [<ffffffff81357c64>] pci_stop_bus_device+0x94/0xa0
 [<ffffffff81357c13>] pci_stop_bus_device+0x43/0xa0
 [<ffffffff81357e16>] pci_stop_and_remove_bus_device+0x16/0x30
 [<ffffffff8136db61>] pciehp_unconfigure_device+0x91/0x190
 [<ffffffff8136d485>] pciehp_disable_slot+0x75/0x1f0
 [<ffffffff8136d6e3>] pciehp_power_thread+0xe3/0x110
 [<ffffffff81071a3a>] process_one_work+0x11a/0x480
 [<ffffffff81072ac5>] worker_thread+0x165/0x370
 [<ffffffff81072960>] ? manage_workers.isra.29+0x130/0x130
 [<ffffffff81077873>] kthread+0x93/0xa0
 [<ffffffff816a1164>] kernel_thread_helper+0x4/0x10
 [<ffffffff810777e0>] ? kthread_freezable_should_stop+0x70/0x70
 [<ffffffff816a1160>] ? gs_change+0x13/0x13
-- 
Daniel J Blueman
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