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async_tx: make async_tx_run_dependencies() easier to read 

* Rename 'next' to 'dep'
* Move the channel switch check inside the loop to simplify
  termination

Acked-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-09-13 19:57:04 -07:00
parent 6bfb09a100
commit fdb0ac8061
1 changed files with 15 additions and 17 deletions
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32
crypto/async_tx/async_tx.c
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@ -115,34 +115,32 @@ EXPORT_SYMBOL_GPL(dma_wait_for_async_tx);
* (start) dependent operations on their target channel
* @tx: transaction with dependencies
*/
void
async_tx_run_dependencies(struct dma_async_tx_descriptor *tx)
void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx)
{
struct dma_async_tx_descriptor *next = tx->next;
struct dma_async_tx_descriptor *dep = tx->next;
struct dma_async_tx_descriptor *dep_next;
struct dma_chan *chan;
if (!next)
if (!dep)
return;
tx->next = NULL;
chan = next->chan;
chan = dep->chan;
/* keep submitting up until a channel switch is detected
* in that case we will be called again as a result of
* processing the interrupt from async_tx_channel_switch
*/
while (next && next->chan == chan) {
struct dma_async_tx_descriptor *_next;
for (; dep; dep = dep_next) {
spin_lock_bh(&dep->lock);
dep->parent = NULL;
dep_next = dep->next;
if (dep_next && dep_next->chan == chan)
dep->next = NULL; /* ->next will be submitted */
else
dep_next = NULL; /* submit current dep and terminate */
spin_unlock_bh(&dep->lock);
spin_lock_bh(&next->lock);
next->parent = NULL;
_next = next->next;
if (_next && _next->chan == chan)
next->next = NULL;
spin_unlock_bh(&next->lock);
next->tx_submit(next);
next = _next;
dep->tx_submit(dep);
}
chan->device->device_issue_pending(chan);