---

yaml
---
r: 64538
b: refs/heads/master
c: e422397
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 97a1ad431b89765755d2b5aa8c0777ed637d5c4a
+refs/heads/master: e4223976341ffb22fabe5b3a69873966808c83aa

trunk/drivers/dma/ioatdma.c

@@ -191,17 +191,12 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan)
 	int i;
 	LIST_HEAD(tmp_list);
 
-	/*
-	 * In-use bit automatically set by reading chanctrl
-	 * If 0, we got it, if 1, someone else did
-	 */
-	chanctrl = readw(ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
-	if (chanctrl & IOAT_CHANCTRL_CHANNEL_IN_USE)
-		return -EBUSY;
+	/* have we already been set up? */
+	if (!list_empty(&ioat_chan->free_desc))
+		return INITIAL_IOAT_DESC_COUNT;
 
         /* Setup register to interrupt and write completion status on error */
-	chanctrl = IOAT_CHANCTRL_CHANNEL_IN_USE |
-		IOAT_CHANCTRL_ERR_INT_EN |
+	chanctrl = IOAT_CHANCTRL_ERR_INT_EN |
 		IOAT_CHANCTRL_ANY_ERR_ABORT_EN |
 		IOAT_CHANCTRL_ERR_COMPLETION_EN;
         writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
@@ -282,11 +277,6 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
 			in_use_descs - 1);
 
 	ioat_chan->last_completion = ioat_chan->completion_addr = 0;
-
-	/* Tell hw the chan is free */
-	chanctrl = readw(ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
-	chanctrl &= ~IOAT_CHANCTRL_CHANNEL_IN_USE;
-	writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
 }
 
 static struct dma_async_tx_descriptor *