We don't support sg for isoc transfers, enforce this.
Signed-off-by: Hans de Goede <[email protected]>
Acked-by: Alan Stern <[email protected]>
---
drivers/usb/core/hcd.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 140d3e1..f546102 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1389,7 +1389,15 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct
urb *urb,
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
if (hcd->self.uses_dma) {
if (urb->num_sgs) {
- int n = dma_map_sg(
+ int n;
+
+ /* We don't support sg for isoc transfers ! */
+ if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ n = dma_map_sg(
hcd->self.controller,
urb->sg,
urb->num_sgs,
--
1.7.10.4
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