USB_RESET_DEVICE(9) USB Core APIs USB_RESET_DEVICE(9)NAME
usb_reset_device - warn interface drivers and perform a USB port reset
int usb_reset_device(struct usb_device * udev);
device to reset (not in SUSPENDED or NOTATTACHED state)
Warns all drivers bound to registered interfaces (using their pre_reset method), performs the port reset, and then lets the drivers know
that the reset is over (using their post_reset method).
The same as for usb_reset_and_verify_device.
The caller must own the device lock. For example, it's safe to use this from a driver probe routine after downloading new firmware. For
calls that might not occur during probe, drivers should lock the device using usb_lock_device_for_reset.
If an interface is currently being probed or disconnected, we assume its driver knows how to handle resets. For all other interfaces, if
the driver doesn't have pre_reset and post_reset methods then we attempt to unbind it and rebind afterward.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_RESET_DEVICE(9)
Check Out this Related Man Page
USB_QUEUE_RESET_DEVI(9) USB Core APIs USB_QUEUE_RESET_DEVI(9)NAME
usb_queue_reset_device - Reset a USB device from an atomic context
void usb_queue_reset_device(struct usb_interface * iface);
USB interface belonging to the device to reset
This function can be used to reset a USB device from an atomic context, where usb_reset_device won't work (as it blocks).
Doing a reset via this method is functionally equivalent to calling usb_reset_device, except for the fact that it is delayed to a
workqueue. This means that any drivers bound to other interfaces might be unbound, as well as users from usbfs in user space.
- Scheduling two resets at the same time from two different drivers attached to two different interfaces of the same device is possible;
depending on how the driver attached to each interface handles ->pre_reset, the second reset might happen or not.
- If a driver is unbound and it had a pending reset, the reset will be cancelled.
- This function can be called during .probe or .disconnect times. On return from .disconnect, any pending resets will be cancelled.
There is no no need to lock/unlock the reset_ws as schedule_work does its own.
We don't do any reference count tracking because it is not needed. The lifecycle of the work_struct is tied to the usb_interface. Before
destroying the interface we cancel the work_struct, so the fact that work_struct is queued and or running means the interface (and thus,
the device) exist and are referenced.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_QUEUE_RESET_DEVI(9)
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