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async_tx: fix multiple dependency submission

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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 <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2008-04-17 20:17:25 -07:00
commit 19242d7233
4 changed files with 170 additions and 47 deletions
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2
drivers/dma/dmaengine.c
View file

@ -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);

9
drivers/dma/iop-adma.c
View file

@ -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 *