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The pci_save_state() call in vmd_suspend() can be performed by pci_pm_suspend_irq(). This also allows VMD to benefit from the call into pci_prepare_to_sleep(). The pci_restore_state() call in vmd_resume() was restoring state after pci_pm_resume()::pci_restore_standard_config() had already restored state. It's also been suspected that the config state should have been restored before re-requesting IRQs instead of afterwards. Remove the pci_save_state()/pci_restore_state() calls in vmd_suspend()/vmd_resume() to allow proper flow through generic PCI core Power Management code. Link: https://lore.kernel.org/r/20200806210017.5654-1-jonathan.derrick@intel.com Signed-off-by: Jon Derrick <jonathan.derrick@intel.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Kai-Heng Feng <kai.heng.feng@canonical.com> Cc: You-Sheng Yang <vicamo.yang@canonical.com>