From ff8cbf250b448aac35589f6075082c3fcad8a8fe Mon Sep 17 00:00:00 2001 From: Lu Baolu Date: Tue, 24 Jun 2014 17:14:43 +0300 Subject: [PATCH] xhci: clear root port wake on bits if controller isn't wake-up capable When xHCI PCI host is suspended, if do_wakeup is false in xhci_pci_suspend, xhci_bus_suspend needs to clear all root port wake on bits. Otherwise some Intel platforms may get a spurious wakeup, even if PCI PME# is disabled. This patch should be back-ported to kernels as old as 2.6.37, that contains the commit 9777e3ce907d4cb5a513902a87ecd03b52499569 "USB: xHCI: bus power management implementation". Cc: stable@vger.kernel.org # 2.6.37 Signed-off-by: Lu Baolu Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-hub.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 2b998c60faf2..aa79e8749040 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -22,6 +22,7 @@ #include +#include #include #include "xhci.h" @@ -1139,7 +1140,9 @@ int xhci_bus_suspend(struct usb_hcd *hcd) * including the USB 3.0 roothub, but only if CONFIG_PM_RUNTIME * is enabled, so also enable remote wake here. */ - if (hcd->self.root_hub->do_remote_wakeup) { + if (hcd->self.root_hub->do_remote_wakeup + && device_may_wakeup(hcd->self.controller)) { + if (t1 & PORT_CONNECT) { t2 |= PORT_WKOC_E | PORT_WKDISC_E; t2 &= ~PORT_WKCONN_E;