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igb: Fix an issue that PME is not enabled during runtime suspend 

I210 ethernet card doesn't wakeup when a cable gets plugged. It's
because its PME is not set.

Since commit 42eca23021 ("PCI: Don't touch card regs after runtime
suspend D3"), if the PCI state is saved, pci_pm_runtime_suspend() stops
calling pci_finish_runtime_suspend(), which enables the PCI PME.

To fix the issue, let's not to save PCI states when it's runtime
suspend, to let the PCI subsystem enables PME.

Fixes: 42eca23021 ("PCI: Don't touch card regs after runtime suspend D3")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Kai-Heng Feng 2018-12-03 13:54:38 +08:00 committed by Jeff Kirsher
parent eec903769b
commit 1fb3a7a75e
1 changed files with 5 additions and 3 deletions
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2
drivers/net/ethernet/intel/igb/igb_main.c
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@ -8771,9 +8771,11 @@ static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake,
rtnl_unlock();
#ifdef CONFIG_PM
if (!runtime) {
retval = pci_save_state(pdev);
if (retval)
return retval;
}
#endif
status = rd32(E1000_STATUS);