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PCI: hv: Delete the device earlier from hbus->children for hot-remove 

After we send a PCI_EJECTION_COMPLETE message to the host, the host will
immediately send us a PCI_BUS_RELATIONS message with
relations->device_count == 0, so pci_devices_present_work(), running on
another thread, can find the being-ejected device, mark the
hpdev->reported_missing to true, and run list_move_tail()/list_del() for
the device -- this races hv_eject_device_work() -> list_del().

Move the list_del() in hv_eject_device_work() to an earlier place, i.e.,
before we send PCI_EJECTION_COMPLETE, so later the
pci_devices_present_work() can't see the device.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jake Oshins <jakeo@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
CC: Haiyang Zhang <haiyangz@microsoft.com>
CC: Vitaly Kuznetsov <vkuznets@redhat.com>
hifive-unleashed-5.1
Dexuan Cui 2016-11-10 07:19:52 +00:00 committed by Bjorn Helgaas
parent 17978524a6
commit e74d2ebdda
1 changed files with 4 additions and 4 deletions
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8
drivers/pci/host/pci-hyperv.c
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@ -1582,6 +1582,10 @@ static void hv_eject_device_work(struct work_struct *work)
pci_dev_put(pdev);
}
spin_lock_irqsave(&hpdev->hbus->device_list_lock, flags);
list_del(&hpdev->list_entry);
spin_unlock_irqrestore(&hpdev->hbus->device_list_lock, flags);
memset(&ctxt, 0, sizeof(ctxt));
ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message;
ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE;
@ -1590,10 +1594,6 @@ static void hv_eject_device_work(struct work_struct *work)
sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
VM_PKT_DATA_INBAND, 0);
spin_lock_irqsave(&hpdev->hbus->device_list_lock, flags);
list_del(&hpdev->list_entry);
spin_unlock_irqrestore(&hpdev->hbus->device_list_lock, flags);
put_pcichild(hpdev, hv_pcidev_ref_childlist);
put_pcichild(hpdev, hv_pcidev_ref_pnp);
put_hvpcibus(hpdev->hbus);