diff options
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/driver.c | 9 | ||||
| -rw-r--r-- | drivers/usb/core/hub.c | 6 |
2 files changed, 13 insertions, 2 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 801b6f142fa7..ebccdefcc6f2 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1523,9 +1523,14 @@ static int usb_suspend(struct device *dev, pm_message_t message) udev = to_usb_device(dev); /* If udev is already suspended, we can skip this suspend and - * we should also skip the upcoming system resume. */ + * we should also skip the upcoming system resume. High-speed + * root hubs are an exception; they need to resume whenever the + * system wakes up in order for USB-PERSIST port handover to work + * properly. + */ if (udev->state == USB_STATE_SUSPENDED) { - udev->skip_sys_resume = 1; + if (udev->parent || udev->speed != USB_SPEED_HIGH) + udev->skip_sys_resume = 1; return 0; } diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 57aeca160f38..a42db75c2336 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2890,7 +2890,13 @@ loop: static int hub_thread(void *__unused) { + /* khubd needs to be freezable to avoid intefering with USB-PERSIST + * port handover. Otherwise it might see that a full-speed device + * was gone before the EHCI controller had handed its port over to + * the companion full-speed controller. + */ set_freezable(); + do { hub_events(); wait_event_freezable(khubd_wait, |