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- wheezy 3.2.78-1
| KFIFO_DMA_OUT_PREPAR(9) | FIFO Buffer | KFIFO_DMA_OUT_PREPAR(9) |
NAME¶
kfifo_dma_out_prepare - setup a scatterlist for DMA outputSYNOPSIS¶
kfifo_dma_out_prepare(fifo,
sgl, nents, len);
ARGUMENTS¶
fifoaddress of the fifo to be used
sgl
pointer to the scatterlist array
nents
number of entries in the scatterlist
array
len
number of elements to transfer
DESCRIPTION¶
This macro fills a scatterlist for DMA output which at most len bytes to transfer. It returns the number entries in the scatterlist array. A zero means there is no space available and the scatterlist is not filled. Note that with only one concurrent reader and one concurrent writer, you don't need extra locking to use these macros.COPYRIGHT¶
| March 2016 | Kernel Hackers Manual 3.2. |