[PATCH v2] usbip: Fix vhci_urb_enqueue() URB null transfer buffer error path

[Shuah Khan]

Fix vhci_urb_enqueue() to print debug msg and return error instead of
failing with BUG_ON.

Signed-off-by: Shuah Khan <sh...@kernel.org>
---
 drivers/usb/usbip/vhci_hcd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 1e592ec94ba4..f46ee1fefe02 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -702,8 +702,10 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct 
urb *urb, gfp_t mem_flag
        }
        vdev = &vhci_hcd->vdev[portnum-1];
 
-       /* patch to usb_sg_init() is in 2.5.60 */
-       BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
+       if (!urb->transfer_buffer && urb->transfer_buffer_length) {
+               dev_dbg(dev, "Null URB transfer buffer\n");
+               return -EINVAL;
+       }
 
        spin_lock_irqsave(&vhci->lock, flags);
 
-- 
2.17.1