dw_dmac: implement a private tx_list

Drop dw_dmac's use of tx_list from struct dma_async_tx_descriptor in
preparation for removal of this field.

Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 98c9a84..514ef7d 100644 (file)
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -116,7 +116,7 @@ static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc)
 {
        struct dw_desc  *child;
 
-       list_for_each_entry(child, &desc->txd.tx_list, desc_node)
+       list_for_each_entry(child, &desc->tx_list, desc_node)
                dma_sync_single_for_cpu(chan2parent(&dwc->chan),
                                child->txd.phys, sizeof(child->lli),
                                DMA_TO_DEVICE);
@@ -137,11 +137,11 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
                dwc_sync_desc_for_cpu(dwc, desc);
 
                spin_lock_bh(&dwc->lock);
-               list_for_each_entry(child, &desc->txd.tx_list, desc_node)
+               list_for_each_entry(child, &desc->tx_list, desc_node)
                        dev_vdbg(chan2dev(&dwc->chan),
                                        "moving child desc %p to freelist\n",
                                        child);
-               list_splice_init(&desc->txd.tx_list, &dwc->free_list);
+               list_splice_init(&desc->tx_list, &dwc->free_list);
                dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc);
                list_add(&desc->desc_node, &dwc->free_list);
                spin_unlock_bh(&dwc->lock);
@@ -209,7 +209,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc)
        param = txd->callback_param;
 
        dwc_sync_desc_for_cpu(dwc, desc);
-       list_splice_init(&txd->tx_list, &dwc->free_list);
+       list_splice_init(&desc->tx_list, &dwc->free_list);
        list_move(&desc->desc_node, &dwc->free_list);
 
        /*
@@ -289,7 +289,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
                        /* This one is currently in progress */
                        return;
 
-               list_for_each_entry(child, &desc->txd.tx_list, desc_node)
+               list_for_each_entry(child, &desc->tx_list, desc_node)
                        if (child->lli.llp == llp)
                                /* Currently in progress */
                                return;
@@ -356,7 +356,7 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
        dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
                        "  cookie: %d\n", bad_desc->txd.cookie);
        dwc_dump_lli(dwc, &bad_desc->lli);
-       list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node)
+       list_for_each_entry(child, &bad_desc->tx_list, desc_node)
                dwc_dump_lli(dwc, &child->lli);
 
        /* Pretend the descriptor completed successfully */
@@ -608,7 +608,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
                                        prev->txd.phys, sizeof(prev->lli),
                                        DMA_TO_DEVICE);
                        list_add_tail(&desc->desc_node,
-                                       &first->txd.tx_list);
+                                       &first->tx_list);
                }
                prev = desc;
        }
@@ -700,7 +700,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                                                sizeof(prev->lli),
                                                DMA_TO_DEVICE);
                                list_add_tail(&desc->desc_node,
-                                               &first->txd.tx_list);
+                                               &first->tx_list);
                        }
                        prev = desc;
                        total_len += len;
@@ -746,7 +746,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                                                sizeof(prev->lli),
                                                DMA_TO_DEVICE);
                                list_add_tail(&desc->desc_node,
-                                               &first->txd.tx_list);
+                                               &first->tx_list);
                        }
                        prev = desc;
                        total_len += len;
@@ -902,6 +902,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
                        break;
                }
 
+               INIT_LIST_HEAD(&desc->tx_list);
                dma_async_tx_descriptor_init(&desc->txd, chan);
                desc->txd.tx_submit = dwc_tx_submit;
                desc->txd.flags = DMA_CTRL_ACK;

diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index 13a5807..d9a939f 100644 (file)
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -217,6 +217,7 @@ struct dw_desc {
 
        /* THEN values for driver housekeeping */
        struct list_head                desc_node;
+       struct list_head                tx_list;
        struct dma_async_tx_descriptor  txd;
        size_t                          len;
 };