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Diffstat (limited to 'drivers/usb/core/hub.c')
| -rw-r--r-- | drivers/usb/core/hub.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f78bd124d29..5faf7edd73c 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1039,6 +1039,39 @@ void usb_set_device_state(struct usb_device *udev, EXPORT_SYMBOL(usb_set_device_state); +#ifdef CONFIG_PM + +/** + * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power + * @rhdev: struct usb_device for the root hub + * + * The USB host controller driver calls this function when its root hub + * is resumed and Vbus power has been interrupted or the controller + * has been reset. The routine marks all the children of the root hub + * as NOTATTACHED and marks logical connect-change events on their ports. + */ +void usb_root_hub_lost_power(struct usb_device *rhdev) +{ + struct usb_hub *hub; + int port1; + unsigned long flags; + + dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); + spin_lock_irqsave(&device_state_lock, flags); + hub = hdev_to_hub(rhdev); + for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { + if (rhdev->children[port1 - 1]) { + recursively_mark_NOTATTACHED( + rhdev->children[port1 - 1]); + set_bit(port1, hub->change_bits); + } + } + spin_unlock_irqrestore(&device_state_lock, flags); +} +EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); + +#endif + static void choose_address(struct usb_device *udev) { int devnum; |