[PATCH] DMA ENGINE: Do not reset 'private' of channel
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From: Jassi Brar on 4 May 2010 05:30 The member 'private' of 'struct dma_chan' is meant for passing data between client and the controller driver. The DMA client driver may point it to platform specific stuff after acquiring the channel. So, it is the responsiblity of the same code to reset it, if it must. The DMA engine doesn't set it and hence, shouldn't reset it either. Signed-off-by: Jassi Brar <jassi.brar(a)samsung.com> This reseting of private by DMA Engine comes in the way of implementing default channel settings during DMAC probe. That capability is useful for not having the clients to always provide platform specific data, like Rx/Tx FIFO addresses, which usually doesn't change across channel requests. --- drivers/dma/dmaengine.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 6f51a0a..d911e38 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -514,7 +514,6 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v break; if (--device->privatecnt == 0) dma_cap_clear(DMA_PRIVATE, device->cap_mask); - chan->private = NULL; chan = NULL; } } @@ -536,7 +535,6 @@ void dma_release_channel(struct dma_chan *chan) /* drop PRIVATE cap enabled by __dma_request_channel() */ if (--chan->device->privatecnt == 0) dma_cap_clear(DMA_PRIVATE, chan->device->cap_mask); - chan->private = NULL; mutex_unlock(&dma_list_mutex); } EXPORT_SYMBOL_GPL(dma_release_channel); -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |