1KFIFO_DMA_OUT_PREPAR(9)           FIFO Buffer          KFIFO_DMA_OUT_PREPAR(9)
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NAME

6       kfifo_dma_out_prepare - setup a scatterlist for DMA output
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SYNOPSIS

9       kfifo_dma_out_prepare(fifo, sgl, nents, len);
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ARGUMENTS

12       fifo
13           address of the fifo to be used
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15       sgl
16           pointer to the scatterlist array
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18       nents
19           number of entries in the scatterlist array
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21       len
22           number of elements to transfer
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DESCRIPTION

25       This macro fills a scatterlist for DMA output which at most len bytes
26       to transfer. It returns the number entries in the scatterlist array. A
27       zero means there is no space available and the scatterlist is not
28       filled.
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30       Note that with only one concurrent reader and one concurrent writer,
31       you don't need extra locking to use these macros.
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34Kernel Hackers Manual 3.10         June 2019           KFIFO_DMA_OUT_PREPAR(9)
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