[PATCH 6/8 resend] dw_dmac: Mark all tx_descriptors with DMA_CRTL_ACK after xfer finish
From: Viresh Kumar <hidden>
Date: 2011-02-28 10:42:47
Also in:
lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
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 <redacted> --- 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