[PATCH next] fixup! usb: xhci: reset endpoint on USB stall

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

usb: xhci: call dma_unmap_single in all error paths

A new early exit for stalled USB was added that resets the endpoint
before returning an error code to the caller.

This unintentionally happened before unmapping the buffer, which is
detected by CONFIG_DMA_API_DEBUG:

  usb2-0: Resetting EP 0...
  WARNING: dwc3 2f00000.usb@2f00000.of: from-device mapping 0xbdf96680+0xff: duplicate mapping

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/usb/host/xhci-ring.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 5f68bc7c2f35..691d9c7463ad 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1045,15 +1045,16 @@ int xhci_ctrl_tx(struct usb_device *udev, unsigned long pipe,
 
 	record_transfer_result(udev, event, length);
 	xhci_acknowledge_event(ctrl);
-	if (udev->status == USB_ST_STALLED) {
-		reset_ep(udev, ep_index, timeout_ms);
-		return -EPIPE;
-	}
 
 	/* Invalidate buffer to make it available to usb-core */
 	if (length > 0)
 		dma_unmap_single(ctrl->host.hw_dev, map, length, direction);
 
+	if (udev->status == USB_ST_STALLED) {
+		reset_ep(udev, ep_index, timeout_ms);
+		return -EPIPE;
+	}
+
 	if (GET_COMP_CODE(le32_to_cpu(event->trans_event.transfer_len))
 			== COMP_SHORT_TX) {
 		/* Short data stage, clear up additional status stage event */
-- 
2.39.2