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PCI: PM: Fix ordering of operations in pci_back_from_sleep() 

The ordering of operations in pci_back_from_sleep() is incorrect,
because the device may be in D3cold when it runs and pci_enable_wake()
needs to access the device's configuration space which cannot be
done in D3cold.

Fix this by calling pci_set_power_state() to put the device into D0
before calling pci_enable_wake() for it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rafael J. Wysocki 2021-10-15 18:45:59 +02:00
parent fa1a25c51d
commit 6f9f0eef00
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/pci.c
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@ -2638,8 +2638,13 @@ EXPORT_SYMBOL(pci_prepare_to_sleep);
*/
int pci_back_from_sleep(struct pci_dev *dev)
{
int ret = pci_set_power_state(dev, PCI_D0);
if (ret)
return ret;
pci_enable_wake(dev, PCI_D0, false);
return pci_set_power_state(dev, PCI_D0);
return 0;
}
EXPORT_SYMBOL(pci_back_from_sleep);