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From: Greg KH on 10 May 2010 19:00 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ This is a backport of commit 5f677f1d45b2bf08085bbba7394392dfa586fa8e. Some of the functionality had to be removed, but it should still fix the webcam problem. This patch (as1363b) changes the way USB remote wakeup is handled during system sleeps. It won't be enabled unless an interface driver specifically needs it. Also, it won't be enabled during the FREEZE or QUIESCE phases of hibernation, when the system doesn't respond to wakeup events anyway. This will fix problems people have reported with certain USB webcams that generate wakeup requests when they shouldn't, and as a result cause system suspends to fail. See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/515109 Signed-off-by: Alan Stern <stern(a)rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de> --- drivers/usb/core/driver.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1175,9 +1175,8 @@ static int usb_suspend_both(struct usb_d udev->state == USB_STATE_SUSPENDED) goto done; - udev->do_remote_wakeup = device_may_wakeup(&udev->dev); - if (msg.event & PM_EVENT_AUTO) { + udev->do_remote_wakeup = device_may_wakeup(&udev->dev); status = autosuspend_check(udev, 0); if (status < 0) goto done; @@ -1742,6 +1741,34 @@ int usb_external_resume_device(struct us return status; } +static void choose_wakeup(struct usb_device *udev, pm_message_t msg) +{ + int w, i; + struct usb_interface *intf; + + /* Remote wakeup is needed only when we actually go to sleep. + * For things like FREEZE and QUIESCE, if the device is already + * autosuspended then its current wakeup setting is okay. + */ + if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) { + udev->do_remote_wakeup = 0; + return; + } + + /* If remote wakeup is permitted, see whether any interface drivers + * actually want it. + */ + w = 0; + if (device_may_wakeup(&udev->dev) && udev->actconfig) { + for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { + intf = udev->actconfig->interface[i]; + w |= intf->needs_remote_wakeup; + } + } + + udev->do_remote_wakeup = w; +} + int usb_suspend(struct device *dev, pm_message_t msg) { struct usb_device *udev; @@ -1761,6 +1788,7 @@ int usb_suspend(struct device *dev, pm_m } udev->skip_sys_resume = 0; + choose_wakeup(udev, msg); return usb_external_suspend_device(udev, msg); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |