fsldma: implement a private tx_list

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

Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 10 insertions, 7 deletions

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index ef87a8984145..73dd74823195 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -326,7 +326,8 @@ static void fsl_chan_toggle_ext_start(struct fsl_dma_chan *fsl_chan, int enable)
 static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
 {
         struct fsl_dma_chan *fsl_chan = to_fsl_chan(tx->chan);
-        struct fsl_desc_sw *desc;
+        struct fsl_desc_sw *desc = tx_to_fsl_desc(tx);
+        struct fsl_desc_sw *child;
         unsigned long flags;
         dma_cookie_t cookie;
 
@@ -334,7 +335,7 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
         spin_lock_irqsave(&fsl_chan->desc_lock, flags);
 
         cookie = fsl_chan->common.cookie;
-        list_for_each_entry(desc, &tx->tx_list, node) {
+        list_for_each_entry(child, &desc->tx_list, node) {
                 cookie++;
                 if (cookie < 0)
                         cookie = 1;
@@ -343,8 +344,8 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
         }
 
         fsl_chan->common.cookie = cookie;
-        append_ld_queue(fsl_chan, tx_to_fsl_desc(tx));
-        list_splice_init(&tx->tx_list, fsl_chan->ld_queue.prev);
+        append_ld_queue(fsl_chan, desc);
+        list_splice_init(&desc->tx_list, fsl_chan->ld_queue.prev);
 
         spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
 
@@ -366,6 +367,7 @@ static struct fsl_desc_sw *fsl_dma_alloc_descriptor(
         desc_sw = dma_pool_alloc(fsl_chan->desc_pool, GFP_ATOMIC, &pdesc);
         if (desc_sw) {
                 memset(desc_sw, 0, sizeof(struct fsl_desc_sw));
+                INIT_LIST_HEAD(&desc_sw->tx_list);
                 dma_async_tx_descriptor_init(&desc_sw->async_tx,
                                                 &fsl_chan->common);
                 desc_sw->async_tx.tx_submit = fsl_dma_tx_submit;
@@ -455,7 +457,7 @@ fsl_dma_prep_interrupt(struct dma_chan *chan, unsigned long flags)
         new->async_tx.flags = flags;
 
         /* Insert the link descriptor to the LD ring */
-        list_add_tail(&new->node, &new->async_tx.tx_list);
+        list_add_tail(&new->node, &new->tx_list);
 
         /* Set End-of-link to the last link descriptor of new list*/
         set_ld_eol(fsl_chan, new);
@@ -513,7 +515,7 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
                 dma_dest += copy;
 
                 /* Insert the link descriptor to the LD ring */
-                list_add_tail(&new->node, &first->async_tx.tx_list);
+                list_add_tail(&new->node, &first->tx_list);
         } while (len);
 
         new->async_tx.flags = flags; /* client is in control of this ack */
@@ -528,7 +530,7 @@ fail:
         if (!first)
                 return NULL;
 
-        list = &first->async_tx.tx_list;
+        list = &first->tx_list;
         list_for_each_entry_safe_reverse(new, prev, list, node) {
                 list_del(&new->node);
                 dma_pool_free(fsl_chan->desc_pool, new, new->async_tx.phys);
diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index dc7f26865797..4493afed53f0 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -90,6 +90,7 @@ struct fsl_dma_ld_hw {
 struct fsl_desc_sw {
         struct fsl_dma_ld_hw hw;
         struct list_head node;
+        struct list_head tx_list;
         struct dma_async_tx_descriptor async_tx;
         struct list_head *ld;
         void *priv;