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authorDan Williams <dan.j.williams@intel.com>2008-04-17 20:17:25 -0700
committerDan Williams <dan.j.williams@intel.com>2008-04-17 13:25:05 -0700
commit19242d7233df7d658405d4b7ee1758d21414cfaa (patch)
tree4bffa2700c30fdb454dfa150115a0607c6cf3d2a /drivers/dma
parent1c62979ed29a8e2bf9fbe1db101c81a0089676f8 (diff)
downloadlinux-19242d7233df7d658405d4b7ee1758d21414cfaa.tar.bz2
async_tx: fix multiple dependency submission
Shrink struct dma_async_tx_descriptor and introduce async_tx_channel_switch to properly inject a channel switch interrupt in the descriptor stream. This simplifies the locking model as drivers no longer need to handle dma_async_tx_descriptor.lock. Acked-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c2
-rw-r--r--drivers/dma/iop-adma.c9
2 files changed, 5 insertions, 6 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 8db0e7f9d3f4..9cb898a76bb3 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -600,8 +600,6 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
{
tx->chan = chan;
spin_lock_init(&tx->lock);
- INIT_LIST_HEAD(&tx->depend_node);
- INIT_LIST_HEAD(&tx->depend_list);
}
EXPORT_SYMBOL(dma_async_tx_descriptor_init);
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index f82b0906d466..21854cd7190f 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -63,7 +63,6 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
{
BUG_ON(desc->async_tx.cookie < 0);
- spin_lock_bh(&desc->async_tx.lock);
if (desc->async_tx.cookie > 0) {
cookie = desc->async_tx.cookie;
desc->async_tx.cookie = 0;
@@ -101,7 +100,6 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
/* run dependent operations */
async_tx_run_dependencies(&desc->async_tx);
- spin_unlock_bh(&desc->async_tx.lock);
return cookie;
}
@@ -275,8 +273,11 @@ iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
static void iop_adma_tasklet(unsigned long data)
{
- struct iop_adma_chan *chan = (struct iop_adma_chan *) data;
- __iop_adma_slot_cleanup(chan);
+ struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
+
+ spin_lock(&iop_chan->lock);
+ __iop_adma_slot_cleanup(iop_chan);
+ spin_unlock(&iop_chan->lock);
}
static struct iop_adma_desc_slot *