suse man page for usb_clear_halt

USB_CLEAR_HALT(9)						   USB Core APIs						 USB_CLEAR_HALT(9)

NAME
       usb_clear_halt - tells device to clear endpoint halt/stall condition

SYNOPSIS
       int usb_clear_halt(struct usb_device * dev, int pipe);

ARGUMENTS
       dev
	   device whose endpoint is halted

       pipe
	   endpoint "pipe" being cleared

CONTEXT
       !in_interrupt ()

DESCRIPTION
       This is used to clear halt conditions for bulk and interrupt endpoints, as reported by URB completion status. Endpoints that are halted are
       sometimes referred to as being "stalled". Such endpoints are unable to transmit or receive data until the halt status is cleared. Any URBs
       queued for such an endpoint should normally be unlinked by the driver before clearing the halt condition, as described in sections 5.7.5
       and 5.8.5 of the USB 2.0 spec.

       Note that control and isochronous endpoints don't halt, although control endpoints report "protocol stall" (for unsupported requests) using
       the same status code used to report a true stall.

       This call is synchronous, and may not be used in an interrupt context.

       Returns zero on success, or else the status code returned by the underlying usb_control_msg call.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							 USB_CLEAR_HALT(9)