usb_buffer_map man page on Scientific

usb_buffer_map man page on Scientific

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USB_BUFFER_MAP(9)		 USB Core APIs		     USB_BUFFER_MAP(9)

NAME
       usb_buffer_map - create DMA mapping(s) for an urb

SYNOPSIS
       struct urb * usb_buffer_map(struct urb * urb);

ARGUMENTS
       urb
	   urb whose transfer_buffer/setup_packet will be mapped

DESCRIPTION
       Return value is either null (indicating no buffer could be mapped), or
       the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are
       added to urb->transfer_flags if the operation succeeds. If the device
       is connected to this system through a non-DMA controller, this
       operation always succeeds.

       This call would normally be used for an urb which is reused, perhaps as
       the target of a large periodic transfer, with usb_buffer_dmasync calls
       to synchronize memory and dma state.

       Reverse the effect of this call with usb_buffer_unmap.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		     USB_BUFFER_MAP(9)

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