From a2bd1140a264b561e38d99e656cd843c2d840e86 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Wed, 4 Apr 2012 16:10:46 -0700 Subject: netdma: adding alignment check for NETDMA ops This is the fallout from adding memcpy alignment workaround for certain IOATDMA hardware. NetDMA will only use DMA engine that can handle byte align ops. Acked-by: David S. Miller Signed-off-by: Dave Jiang Signed-off-by: Dan Williams --- drivers/dma/dmaengine.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/dma/dmaengine.c') diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index a6c6051ec858..0f1ca74fe0bb 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -332,6 +332,20 @@ struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type) } EXPORT_SYMBOL(dma_find_channel); +/* + * net_dma_find_channel - find a channel for net_dma + * net_dma has alignment requirements + */ +struct dma_chan *net_dma_find_channel(void) +{ + struct dma_chan *chan = dma_find_channel(DMA_MEMCPY); + if (chan && !is_dma_copy_aligned(chan->device, 1, 1, 1)) + return NULL; + + return chan; +} +EXPORT_SYMBOL(net_dma_find_channel); + /** * dma_issue_pending_all - flush all pending operations across all channels */ -- cgit v1.2.3