PCI / PM: Force devices to D0 in pci_pm_thaw_noirq()
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>
Fri, 15 Dec 2017 02:07:18 +0000 (03:07 +0100)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Mon, 18 Dec 2017 11:06:07 +0000 (12:06 +0100)
commit5839ee7389e893a31e4e3c9cf17b50d14103c902
tree368d4161f85d75c1839e68cd018fa5e7c22b3e6f
parent1291a0d5049dbc06baaaf66a9ff3f53db493b19b
PCI / PM: Force devices to D0 in pci_pm_thaw_noirq()

It is incorrect to call pci_restore_state() for devices in low-power
states (D1-D3), as that involves the restoration of MSI setup which
requires MMIO to be operational and that is only the case in D0.

However, pci_pm_thaw_noirq() may do that if the driver's "freeze"
callbacks put the device into a low-power state, so fix it by making
it force devices into D0 via pci_set_power_state() instead of trying
to "update" their power state which is pointless.

Fixes: e60514bd4485 (PCI/PM: Restore the status of PCI devices across hibernation)
Cc: 4.13+ <stable@vger.kernel.org> # 4.13+
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Maarten Lankhorst <dev@mblankhorst.nl>
Tested-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Maarten Lankhorst <dev@mblankhorst.nl>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
drivers/pci/pci-driver.c