From mboxrd@z Thu Jan 1 00:00:00 1970 From: viresh.kumar@st.com (Viresh Kumar) Date: Mon, 28 Feb 2011 16:11:21 +0530 Subject: [PATCH 6/8 resend] dw_dmac: Mark all tx_descriptors with DMA_CRTL_ACK after xfer finish In-Reply-To: References: Message-ID: <82027aa0c6446df3f7fb8e3c5fbdc28f60ea33b7.1298889267.git.viresh.kumar@st.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- drivers/dma/dw_dmac.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index c40b89f..01f783d 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -196,6 +196,7 @@ 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); @@ -204,6 +205,12 @@ 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); -- 1.7.2.2