dmaengine: use DMA_COMPLETE for dma completion status

the DMA_SUCCESS is a misnomer as dmaengine indicates the transfer is complete and
gives no guarantee of the transfer success. Hence we should use DMA_COMPLTE
instead of DMA_SUCCESS

Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/dmaengine.c

@@ -1062,7 +1062,7 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
 	unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
 
 	if (!tx)
-		return DMA_SUCCESS;
+		return DMA_COMPLETE;
 
 	while (tx->cookie == -EBUSY) {
 		if (time_after_eq(jiffies, dma_sync_wait_timeout)) {

include/linux/dmaengine.h

@@ -45,13 +45,13 @@ static inline int dma_submit_error(dma_cookie_t cookie)
 
 /**
  * enum dma_status - DMA transaction status
- * @DMA_SUCCESS: transaction completed successfully
+ * @DMA_COMPLETE: transaction completed
  * @DMA_IN_PROGRESS: transaction not yet processed
  * @DMA_PAUSED: transaction is paused
  * @DMA_ERROR: transaction failed
  */
 enum dma_status {
-	DMA_SUCCESS,
+	DMA_SUCCESS = 0, DMA_COMPLETE = 0,
 	DMA_IN_PROGRESS,
 	DMA_PAUSED,
 	DMA_ERROR,
@@ -979,10 +979,10 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
 {
 	if (last_complete <= last_used) {
 		if ((cookie <= last_complete) || (cookie > last_used))
-			return DMA_SUCCESS;
+			return DMA_COMPLETE;
 	} else {
 		if ((cookie <= last_complete) && (cookie > last_used))
-			return DMA_SUCCESS;
+			return DMA_COMPLETE;
 	}
 	return DMA_IN_PROGRESS;
 }
@@ -1013,11 +1013,11 @@ static inline struct dma_chan *dma_find_channel(enum dma_transaction_type tx_typ
 }
 static inline enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
 {
-	return DMA_SUCCESS;
+	return DMA_COMPLETE;
 }
 static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
 {
-	return DMA_SUCCESS;
+	return DMA_COMPLETE;
 }
 static inline void dma_issue_pending_all(void)
 {