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Returns 0 if the channel is NULL or does not support XOR operations. Signed-off-by: Frank Li --- include/linux/dmaengine.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 7fce44bd7c049..a4c9eef369cb4 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -1232,6 +1232,21 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memcpy( len, flags); } +/** + * dmaengine_get_max_xor - get the maximum number of XOR sources for a channel + * @chan: DMA channel + * + * Returns the maximum number of source buffers supported by the XOR engine + * behind @chan, or 0 if the channel does not support XOR operations. + */ +static inline unsigned int dmaengine_get_max_xor(struct dma_chan *chan) +{ + if (!chan || !chan->device) + return 0; + + return chan->device->max_xor; +} + /** * dmaengine_prep_dma_xor - prepare a DMA XOR operation * @chan: the channel to use for this operation -- 2.43.0