3 files changed, 8 insertions, 47 deletions

diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c
index 5fbe56b5cea..41b18c5a314 100644
--- a/drivers/dma/ioatdma.c
+++ b/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 *
@@ -347,8 +337,7 @@ ioat_dma_prep_memcpy(struct dma_chan *chan, size_t len, int int_en)
 	new->async_tx.ack = 0; /* client is in control of this ack */
 	new->async_tx.cookie = -EBUSY;
 
-	pci_unmap_len_set(new, src_len, orig_len);
-	pci_unmap_len_set(new, dst_len, orig_len);
+	pci_unmap_len_set(new, len, orig_len);
 	spin_unlock_bh(&ioat_chan->desc_lock);
 
 	return new ? &new->async_tx : NULL;
@@ -423,11 +412,11 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *chan)
 			*/
 			pci_unmap_page(chan->device->pdev,
 					pci_unmap_addr(desc, dst),
-					pci_unmap_len(desc, dst_len),
+					pci_unmap_len(desc, len),
 					PCI_DMA_FROMDEVICE);
 			pci_unmap_page(chan->device->pdev,
 					pci_unmap_addr(desc, src),
-					pci_unmap_len(desc, src_len),
+					pci_unmap_len(desc, len),
 					PCI_DMA_TODEVICE);
 		}
 
diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index d3726478031..bf4dad70e0f 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -111,10 +111,9 @@ struct ioat_desc_sw {
 	struct ioat_dma_descriptor *hw;
 	struct list_head node;
 	int tx_cnt;
+	DECLARE_PCI_UNMAP_LEN(len)
 	DECLARE_PCI_UNMAP_ADDR(src)
-	DECLARE_PCI_UNMAP_LEN(src_len)
 	DECLARE_PCI_UNMAP_ADDR(dst)
-	DECLARE_PCI_UNMAP_LEN(dst_len)
 	struct dma_async_tx_descriptor async_tx;
 };
 
diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c
index d637555a833..e763d723e4c 100644
--- a/drivers/dma/iovlock.c
+++ b/drivers/dma/iovlock.c
@@ -143,29 +143,6 @@ void dma_unpin_iovec_pages(struct dma_pinned_list *pinned_list)
 	kfree(pinned_list);
 }
 
-static dma_cookie_t dma_memcpy_to_kernel_iovec(struct dma_chan *chan, struct
-	iovec *iov, unsigned char *kdata, size_t len)
-{
-	dma_cookie_t dma_cookie = 0;
-
-	while (len > 0) {
-		if (iov->iov_len) {
-			int copy = min_t(unsigned int, iov->iov_len, len);
-			dma_cookie = dma_async_memcpy_buf_to_buf(
-					chan,
-					iov->iov_base,
-					kdata,
-					copy);
-			kdata += copy;
-			len -= copy;
-			iov->iov_len -= copy;
-			iov->iov_base += copy;
-		}
-		iov++;
-	}
-
-	return dma_cookie;
-}
 
 /*
  * We have already pinned down the pages we will be using in the iovecs.
@@ -187,10 +164,6 @@ dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov,
 	if (!chan)
 		return memcpy_toiovec(iov, kdata, len);
 
-	/* -> kernel copies (e.g. smbfs) */
-	if (!pinned_list)
-		return dma_memcpy_to_kernel_iovec(chan, iov, kdata, len);
-
 	iovec_idx = 0;
 	while (iovec_idx < pinned_list->nr_iovecs) {
 		struct dma_page_list *page_list;