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>

diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
index e8362c1..dcbf1be 100644 (file)
--- a/crypto/async_tx/async_tx.c
+++ b/crypto/async_tx/async_tx.c
@@ -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;
-
-               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;
+       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);
+
+               dep->tx_submit(dep);
        }
 
        chan->device->device_issue_pending(chan);