Free dma mapping(s) for a scatterlist
void usb_buffer_unmap_sg(const struct usb_device * dev, int is_in, struct scatterlist * sg, int n_hw_ents);
dev
device to which the scatterlist will be mapped
is_in
mapping transfer direction
sg
the scatterlist to unmap
n_hw_ents
the positive return value from usb_buffer_map_sg
Reverses the effect of usb_buffer_map_sg.