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 42eca2302146 ("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: 42eca2302146 ("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>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index e135adf46980baa43e7bce06ef982b285e25816a..87bdf1604ae2c5933e18827a0a7d5ad02942b936 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -8771,9 +8771,11 @@ static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake,
        rtnl_unlock();
 
 #ifdef CONFIG_PM
-       retval = pci_save_state(pdev);
-       if (retval)
-               return retval;
+       if (!runtime) {
+               retval = pci_save_state(pdev);
+               if (retval)
+                       return retval;
+       }
 #endif
 
        status = rd32(E1000_STATUS);