linux/drivers/pci
Rafael J. Wysocki d491f2b752 PCI: PM: Avoid possible suspend-to-idle issue
If a PCI driver leaves the device handled by it in D0 and calls
pci_save_state() on the device in its ->suspend() or ->suspend_late()
callback, it can expect the device to stay in D0 over the whole
s2idle cycle.  However, that may not be the case if there is a
spurious wakeup while the system is suspended, because in that case
pci_pm_suspend_noirq() will run again after pci_pm_resume_noirq()
which calls pci_restore_state(), via pci_pm_default_resume_early(),
so state_saved is cleared and the second iteration of
pci_pm_suspend_noirq() will invoke pci_prepare_to_sleep() which
may change the power state of the device.

To avoid that, add a new internal flag, skip_bus_pm, that will be set
by pci_pm_suspend_noirq() when it runs for the first time during the
given system suspend-resume cycle if the state of the device has
been saved already and the device is still in D0.  Setting that flag
will cause the next iterations of pci_pm_suspend_noirq() to set
state_saved for pci_pm_resume_noirq(), so that it always restores the
device state from the originally saved data, and avoid calling
pci_prepare_to_sleep() for the device.

Fixes: 33e4f80ee6 ("ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2019-05-27 10:55:08 +02:00
..
controller pci-v5.2-changes 2019-05-14 10:30:10 -07:00
endpoint Merge branch 'remotes/lorenzo/pci/misc' 2019-05-13 18:34:44 -05:00
hotplug pci-v5.2-changes 2019-05-14 10:30:10 -07:00
pcie pci-v5.2-changes 2019-05-14 10:30:10 -07:00
switch pci-v5.2-changes 2019-05-14 10:30:10 -07:00
Kconfig PCI: Fix PCI kconfig menu organization 2019-01-14 17:01:20 -06:00
Makefile PCI: OF: Allow of_pci_get_max_link_speed() to be used by PCI Endpoint drivers 2019-04-15 13:24:02 +01:00
access.c PCI: Uninline PCI bus accessors for better ftracing 2018-10-04 16:37:37 -05:00
ats.c PCI/ATS: Add pci_ats_page_aligned() interface 2019-02-26 11:08:07 +01:00
bus.c PCI: Replace dev_printk(KERN_DEBUG) with dev_info(), etc 2019-05-09 07:49:58 -05:00
ecam.c PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate 2018-01-28 15:48:29 -06:00
host-bridge.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
iov.c PCI/IOV: Add flag so platforms can skip VF scanning 2019-01-01 19:04:37 -06:00
irq.c PCI: Use IRQF_ONESHOT if pci_request_irq() called with no handler 2018-07-31 10:43:43 -05:00
mmap.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
msi.c PCI: Add pci_dev_id() helper 2019-04-29 16:12:05 -05:00
of.c Merge branch 'remotes/lorenzo/pci/keystone' 2019-05-13 18:34:41 -05:00
p2pdma.c PCI/P2PDMA: Allow P2P DMA between any devices under AMD ZEN Root Complex 2019-05-01 16:53:39 -05:00
pci-acpi.c ACPI/PCI: PM: Add missing wakeup.flags.valid checks 2019-05-27 10:51:06 +02:00
pci-bridge-emul.c PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags 2019-02-22 10:51:14 +00:00
pci-bridge-emul.h PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags 2019-02-22 10:51:14 +00:00
pci-driver.c PCI: PM: Avoid possible suspend-to-idle issue 2019-05-27 10:55:08 +02:00
pci-label.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
pci-mid.c x86/cpu: Sanitize FAM6_ATOM naming 2018-10-02 10:14:32 +02:00
pci-pf-stub.c PCI/IOV: Add pci-pf-stub driver for PFs that only enable VFs 2018-04-24 16:47:16 -05:00
pci-stub.c PCI: Replace printk(KERN_INFO) with pr_info(), etc 2019-05-09 07:49:54 -05:00
pci-sysfs.c PCI: Use dev_printk() when possible 2019-05-09 07:49:49 -05:00
pci.c pci-v5.2-changes 2019-05-14 10:30:10 -07:00
pci.h pci-v5.2-changes 2019-05-14 10:30:10 -07:00
probe.c pci-v5.2-changes 2019-05-14 10:30:10 -07:00
proc.c PCI: Mark expected switch fall-throughs 2019-03-20 15:11:11 -05:00
quirks.c pci-v5.2-changes 2019-05-14 10:30:10 -07:00
remove.c PCI/ASPM: Fix link_state teardown on device removal 2018-09-17 16:32:23 -05:00
rom.c PCI: Make pci_get_rom_size() static 2018-06-29 21:17:26 -05:00
search.c PCI: Add pci_dev_id() helper 2019-04-29 16:12:05 -05:00
setup-bus.c Merge branch 'pci/trivial' 2019-05-13 18:34:48 -05:00
setup-irq.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
setup-res.c PCI: Remove messages about reassigning resources 2018-04-11 08:46:50 -05:00
slot.c PCI: Replace printk(KERN_INFO) with pr_info(), etc 2019-05-09 07:49:54 -05:00
syscall.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
vc.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
vpd.c PCI/VPD: Check for VPD access completion before checking for timeout 2018-08-14 16:04:46 -05:00
xen-pcifront.c Merge branch 'pci/printk' 2019-05-13 18:34:46 -05:00