usb_autopm_get_interface_no_resume(9) [centos man page]
USB_AUTOPM_GET_INTER(9) USB Core APIs USB_AUTOPM_GET_INTER(9)NAME
usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter
void usb_autopm_get_interface_no_resume(struct usb_interface * intf);
the usb_interface whose counter should be incremented
This routine increments intf's usage counter but does not carry out an autoresume.
This routine can run in atomic context.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_AUTOPM_GET_INTER(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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