PCI / PM: handle failure to enable wakeup on PCIe PME

If the irqchip handling the PCIe PME interrupt is not able
to enable interrupt wakeup we should properly reflect this
in the PME suspend status.

This fixes a kernel warning on resume, where it would try
to disable the irq wakeup that failed to be activated while
suspending, for example:

WARNING: CPU: 0 PID: 609 at kernel/irq/manage.c:536 irq_set_irq_wake+0xc0/0xf8()
Unbalanced IRQ 384 wake disable

Fixes: 76cde7e49590 (PCI / PM: Make PCIe PME interrupts wake up from suspend-to-idle)
Reported-and-tested-by: Richard Zhu <richard.zhu@freescale.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index a9f9c46e50221d75eefc73457425876199f79a0e..63fc63911295e7c0be875b39436c889c6850234e 100644 (file)
--- a/drivers/pci/pcie/pme.c
+++ b/drivers/pci/pcie/pme.c
@@ -397,6 +397,7 @@ static int pcie_pme_suspend(struct pcie_device *srv)
        struct pcie_pme_service_data *data = get_service_data(srv);
        struct pci_dev *port = srv->port;
        bool wakeup;
+       int ret;
 
        if (device_may_wakeup(&port->dev)) {
                wakeup = true;
@@ -407,9 +408,10 @@ static int pcie_pme_suspend(struct pcie_device *srv)
        }
        spin_lock_irq(&data->lock);
        if (wakeup) {
-               enable_irq_wake(srv->irq);
+               ret = enable_irq_wake(srv->irq);
                data->suspend_level = PME_SUSPEND_WAKEUP;
-       } else {
+       }
+       if (!wakeup || ret) {
                struct pci_dev *port = srv->port;
 
                pcie_pme_interrupt_enable(port, false);