commit e518076ef8cb56adb558ff56ad5bfa0cd9f3abd9
author Viresh Kumar <viresh.kumar@st.com> Thu Mar 03 15:47:20 2011 +0530
committer Vinod Koul <vinod.koul@intel.com> Mon Mar 07 01:12:27 2011 +0530
tree ce195fa32ee663a23a346ac042b70b01385ab58d
parent 418e74070662e1ae7d9bb5202f773d35c9a7f05e

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 <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/dw_dmac.c

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 711ebe9..6ab440e 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -198,6 +198,7 @@
 	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 @@
 	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);