Man page 9 : kfifo_dma_in_finish

kfifo_dma_in_finish - finish a DMA IN operation

kfifo_dma_in_finish( fifo , len );

fifo
    address of the fifo to be used

len
    number of bytes to received

This macro finish a DMA IN operation. The in counter will be updated by the len parameter. No error checking will be done.

Note that with only one concurrent reader and one concurrent writer, you donAqt need extra locking to use these macros.