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USB: don't enable wakeup by default for PCI host controllers 

This patch (as1199) changes the initial wakeup settings for PCI USB
host controllers.  The controllers are marked as capable of waking the
system, but wakeup is not enabled by default.

It turns out that enabling wakeup for USB host controllers has a lot
of bad consequences.  As the simplest example, if a USB mouse or
keyboard is unplugged immediately after the computer is put to sleep,
the unplug will cause the system to wake back up again!  We are better
off marking them as wakeup-capable and leaving wakeup disabled.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
CC: David Brownell <david-b@pacbell.net>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2009-01-13 11:35:54 -05:00 committed by Greg Kroah-Hartman
parent b90de8aea3
commit bcca06efea
3 changed files with 4 additions and 7 deletions
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1
drivers/usb/core/hcd-pci.c
View File

@ -128,7 +128,6 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
}
pci_set_master(dev);
device_set_wakeup_enable(&dev->dev, 1);
retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
if (retval != 0)

2
drivers/usb/host/ehci-pci.c
View File

@ -230,7 +230,7 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
pci_read_config_word(pdev, 0x62, &port_wake);
if (port_wake & 0x0001) {
dev_warn(&pdev->dev, "Enabling legacy PCI PM\n");
device_init_wakeup(&pdev->dev, 1);
device_set_wakeup_capable(&pdev->dev, 1);
}
}

8
drivers/usb/host/ohci-hcd.c
View File

@ -593,12 +593,10 @@ static int ohci_run (struct ohci_hcd *ohci)
* to be checked in case boot firmware (BIOS/SMM/...) has set up
* wakeup in a way the bus isn't aware of (e.g., legacy PCI PM).
* If the bus glue detected wakeup capability then it should
* already be enabled. Either way, if wakeup should be enabled
* but isn't, we'll enable it now.
* already be enabled; if so we'll just enable it again.
*/
if ((ohci->hc_control & OHCI_CTRL_RWC) != 0
&& !device_can_wakeup(hcd->self.controller))
device_init_wakeup(hcd->self.controller, 1);
if ((ohci->hc_control & OHCI_CTRL_RWC) != 0)
device_set_wakeup_capable(hcd->self.controller, 1);
switch (ohci->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER: