Commit 5dfd7f9f authored Oct 22, 2014 by Lucas Stach Committed by Rafael J. Wysocki Oct 23, 2014

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: 76cde7e4 (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>

parent f114040e

drivers/pci/pcie/pme.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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);