Ross Lagerwall 72978b2fe2 xen/manage: Fix USB interaction issues when resuming ... Commit 61a734d305 ("xen/manage: Always freeze/thaw processes when suspend/resuming") ensured that userspace processes were always frozen before suspending to reduce interaction issues when resuming devices. However, freeze_processes() does not freeze kernel threads. Freeze kernel threads as well to prevent deadlocks with the khubd thread when resuming devices. This is what native suspend and resume does. Example deadlock: [ 7279.648010] [<ffffffff81446bde>] ? xen_poll_irq_timeout+0x3e/0x50 [ 7279.648010] [<ffffffff81448d60>] xen_poll_irq+0x10/0x20 [ 7279.648010] [<ffffffff81011723>] xen_lock_spinning+0xb3/0x120 [ 7279.648010] [<ffffffff810115d1>] __raw_callee_save_xen_lock_spinning+0x11/0x20 [ 7279.648010] [<ffffffff815620b6>] ? usb_control_msg+0xe6/0x120 [ 7279.648010] [<ffffffff81747e50>] ? _raw_spin_lock_irq+0x50/0x60 [ 7279.648010] [<ffffffff8174522c>] wait_for_completion+0xac/0x160 [ 7279.648010] [<ffffffff8109c520>] ? try_to_wake_up+0x2c0/0x2c0 [ 7279.648010] [<ffffffff814b60f2>] dpm_wait+0x32/0x40 [ 7279.648010] [<ffffffff814b6eb0>] device_resume+0x90/0x210 [ 7279.648010] [<ffffffff814b7d71>] dpm_resume+0x121/0x250 [ 7279.648010] [<ffffffff8144c570>] ? xenbus_dev_request_and_reply+0xc0/0xc0 [ 7279.648010] [<ffffffff814b80d5>] dpm_resume_end+0x15/0x30 [ 7279.648010] [<ffffffff81449fba>] do_suspend+0x10a/0x200 [ 7279.648010] [<ffffffff8144a2f0>] ? xen_pre_suspend+0x20/0x20 [ 7279.648010] [<ffffffff8144a1d0>] shutdown_handler+0x120/0x150 [ 7279.648010] [<ffffffff8144c60f>] xenwatch_thread+0x9f/0x160 [ 7279.648010] [<ffffffff810ac510>] ? finish_wait+0x80/0x80 [ 7279.648010] [<ffffffff8108d189>] kthread+0xc9/0xe0 [ 7279.648010] [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80 [ 7279.648010] [<ffffffff8175087c>] ret_from_fork+0x7c/0xb0 [ 7279.648010] [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80 [ 7441.216287] INFO: task khubd:89 blocked for more than 120 seconds. [ 7441.219457] Tainted: G X 3.13.11-ckt12.kz #1 [ 7441.222176] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 7441.225827] khubd D ffff88003f433440 0 89 2 0x00000000 [ 7441.229258] ffff88003ceb9b98 0000000000000046 ffff88003ce83000 0000000000013440 [ 7441.232959] ffff88003ceb9fd8 0000000000013440 ffff88003cd13000 ffff88003ce83000 [ 7441.236658] 0000000000000286 ffff88003d3e0000 ffff88003ceb9bd0 00000001001aa01e [ 7441.240415] Call Trace: [ 7441.241614] [<ffffffff817442f9>] schedule+0x29/0x70 [ 7441.243930] [<ffffffff81743406>] schedule_timeout+0x166/0x2c0 [ 7441.246681] [<ffffffff81075b80>] ? call_timer_fn+0x110/0x110 [ 7441.249339] [<ffffffff8174357e>] schedule_timeout_uninterruptible+0x1e/0x20 [ 7441.252644] [<ffffffff81077710>] msleep+0x20/0x30 [ 7441.254812] [<ffffffff81555f00>] hub_port_reset+0xf0/0x580 [ 7441.257400] [<ffffffff81558465>] hub_port_init+0x75/0xb40 [ 7441.259981] [<ffffffff814bb3c9>] ? update_autosuspend+0x39/0x60 [ 7441.262817] [<ffffffff814bb4f0>] ? pm_runtime_set_autosuspend_delay+0x50/0xa0 [ 7441.266212] [<ffffffff8155a64a>] hub_thread+0x71a/0x1750 [ 7441.268728] [<ffffffff810ac510>] ? finish_wait+0x80/0x80 [ 7441.271272] [<ffffffff81559f30>] ? usb_port_resume+0x670/0x670 [ 7441.274067] [<ffffffff8108d189>] kthread+0xc9/0xe0 [ 7441.276305] [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80 [ 7441.279131] [<ffffffff8175087c>] ret_from_fork+0x7c/0xb0 [ 7441.281659] [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80 Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Cc: stable@vger.kernel.org Signed-off-by: David Vrabel <david.vrabel@citrix.com>		2015-02-06 15:49:09 +00:00
..
events	xen/events: support threaded irqs for interdomain event channels	2014-09-23 13:36:19 +00:00
xen-pciback	xen-pciback: drop SR-IOV VFs when PF driver unloads	2014-12-04 12:42:03 +00:00
xenbus	xenbus: Add proper handling of XS_ERROR from Xenbus for transactions.	2015-02-05 15:04:46 +00:00
xenfs	xen: Convert printks to pr_<level>	2013-06-28 11:19:58 -04:00
acpi.c	xen / ACPI: notify xen when reduced hardware sleep is available	2013-07-31 14:22:35 +02:00
balloon.c	xen: remove scratch frames for ballooned pages and m2p override	2015-01-28 14:03:10 +00:00
biomerge.c	xen: using EXPORT_SYMBOL requires including export.h	2012-01-18 15:37:49 -08:00
cpu_hotplug.c	xen: Convert printks to pr_<level>	2013-06-28 11:19:58 -04:00
dbgp.c	xen: Use dev_is_pci() to check whether it is pci device	2014-01-07 09:53:33 -05:00
efi.c	efi: dmi: add support for SMBIOS 3.0 UEFI configuration table	2014-11-05 09:03:16 +01:00
evtchn.c	xen/evtchn: support more than 4096 ports	2014-01-06 10:07:50 -05:00
fallback.c	xen-pciback: notify hypervisor about devices intended to be assigned to guests	2013-03-22 10:20:55 -04:00
features.c
gntalloc.c	xen/gntalloc: safely delete grefs in add_grefs() undo path	2014-09-04 13:14:05 +01:00
gntdev.c	xen/gntdev: provide find_special_page VMA operation	2015-01-28 14:04:58 +00:00
grant-table.c	xen/grant-table: add a mechanism to safely unmap pages that are in use	2015-01-28 14:03:14 +00:00
Kconfig	xen-scsiback: Add Xen PV SCSI backend driver	2014-09-23 13:36:19 +00:00
Makefile	xen-scsiback: Add Xen PV SCSI backend driver	2014-09-23 13:36:19 +00:00
manage.c	xen/manage: Fix USB interaction issues when resuming	2015-02-06 15:49:09 +00:00
mcelog.c	xen: Convert printks to pr_<level>	2013-06-28 11:19:58 -04:00
pci.c	xen/pci: Allocate memory for physdev_pci_device_add's optarr	2014-10-23 16:24:02 +01:00
pcpu.c	drivers: xen: Include appropriate header file in pcpu.c	2014-02-28 15:26:08 -05:00
platform-pci.c	drivers: xen: Mark function as static in platform-pci.c	2014-02-28 15:26:04 -05:00
privcmd.c	xen: privcmd: do not return pages which we have failed to unmap	2013-12-06 17:55:56 +00:00
privcmd.h	xen: Add privcmd device driver	2011-12-16 13:29:31 -05:00
swiotlb-xen.c	Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single"	2014-12-10 14:58:35 +00:00
sys-hypervisor.c	xen: sysfs: fix build warning.	2012-10-19 15:17:51 -04:00
tmem.c	xen/tmem: mark xen_tmem_init() __init	2015-01-23 11:55:24 +00:00
xen-acpi-cpuhotplug.c	ACPI: Drop acpi_evaluate_hotplug_ost() and ACPI_HOTPLUG_OST	2014-02-22 00:50:49 +01:00
xen-acpi-memhotplug.c	ACPI: Drop acpi_evaluate_hotplug_ost() and ACPI_HOTPLUG_OST	2014-02-22 00:50:49 +01:00
xen-acpi-pad.c	ACPI / PAD / xen: use acpi_evaluate_ost() to replace open-coded version	2014-02-21 00:27:47 +01:00
xen-acpi-processor.c	xen-acpi-processor: Don't display errors when we get -ENOSYS	2014-05-23 12:34:00 -04:00
xen-balloon.c	xen: Convert printks to pr_<level>	2013-06-28 11:19:58 -04:00
xen-scsiback.c	xen/grant-table: add helpers for allocating pages	2015-01-28 14:03:12 +00:00
xen-selfballoon.c	drivers:xen-selfballoon:reset 'frontswap_inertia_counter' after frontswap_shrink	2014-02-28 15:26:12 -05:00
xen-stub.c	xen/acpi: remove redundant acpi/acpi_drivers.h include	2013-03-11 13:53:02 -04:00