From: Viresh Kumar Date: Thu, 3 Mar 2011 10:17:20 +0000 (+0530) Subject: dw_dmac: Mark all tx_descriptors with DMA_CRTL_ACK after xfer finish X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e518076ef8cb56adb558ff56ad5bfa0cd9f3abd9;p=linux-beck.git dw_dmac: Mark all tx_descriptors with DMA_CRTL_ACK after xfer finish dwc_desc_get checks all descriptors for DMA_CTRL_ACK before allocating them for transfers. And descriptors are not marked with DMA_CRTL_ACK after transfer finishes. Thus descriptor once used is not usable again. This patch marks descriptors with DMA_CRTL_ACK after dma xfer finishes Signed-off-by: Viresh Kumar Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 711ebe954f5b..6ab440e532bf 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -198,6 +198,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) dma_async_tx_callback callback; void *param; struct dma_async_tx_descriptor *txd = &desc->txd; + struct dw_desc *child; dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); @@ -206,6 +207,12 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) param = txd->callback_param; dwc_sync_desc_for_cpu(dwc, desc); + + /* async_tx_ack */ + list_for_each_entry(child, &desc->tx_list, desc_node) + async_tx_ack(&child->txd); + async_tx_ack(&desc->txd); + list_splice_init(&desc->tx_list, &dwc->free_list); list_move(&desc->desc_node, &dwc->free_list);