usb_buffer_dmasync_sg (9) Linux Manual Page
usb_buffer_dmasync_sg – synchronize DMA and CPU view of scatterlist buffer(s)
Synopsis
void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, struct scatterlist *sg, int n_hw_ents);Arguments
dev
-
- device to which the scatterlist will be mapped
is_in
- mapping transfer direction
sg
- the scatterlist to synchronize
n_hw_ents
- the positive return value from usb_buffer_map_sg
Description
Use this when you are re-using a scatterlist’s data buffers for another USB request.