[PATCH 4.4 008/312] usb: gadget: udc: core: dont starve DMA resources

[Greg Kroah-Hartman]

From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>

commit 23fd537c9508fb6e3b93ddf23982f51afc087781 upstream.

Always unmap all SG entries as required by DMA API

Fixes: a698908d3b3b ("usb: gadget: add generic map/unmap request utilities")
Cc: <stable@xxxxxxxxxxxxxxx> # v3.4+
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/gadget/udc/udc-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -97,7 +97,7 @@ void usb_gadget_unmap_request(struct usb
 		return;
 
 	if (req->num_mapped_sgs) {
-		dma_unmap_sg(gadget->dev.parent, req->sg, req->num_mapped_sgs,
+		dma_unmap_sg(gadget->dev.parent, req->sg, req->num_sgs,
 				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 
 		req->num_mapped_sgs = 0;