1USB_ROOT_HUB_LOST_PO(9)          USB Core APIs         USB_ROOT_HUB_LOST_PO(9)
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NAME

6       usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
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SYNOPSIS

9       void usb_root_hub_lost_power(struct usb_device * rhdev);
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ARGUMENTS

12       rhdev
13           struct usb_device for the root hub
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DESCRIPTION

16       The USB host controller driver calls this function when its root hub is
17       resumed and Vbus power has been interrupted or the controller has been
18       reset. The routine marks rhdev as having lost power. When the hub
19       driver is resumed it will take notice and carry out power-session
20       recovery for all the “USB-PERSIST”-enabled child devices; the others
21       will be disconnected.
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24Kernel Hackers Manual 2.6.         June 2019           USB_ROOT_HUB_LOST_PO(9)
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