fsl_usb2_udc: Add a wmb before priming endpoint.
Add a wmb to fsl_queue_td before priming the endpoint. This ensures that the
modifications to the QH are seen by the hardware.
Added comment as suggested by Felipe Balbi.
Signed-off-by: Will Newton <will.newton@gmail.com>
Acked-by: Li Yang <leoli@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
index 6f62720..0492441 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_usb2_udc.c
@@ -643,6 +643,9 @@
| EP_QUEUE_HEAD_STATUS_HALT));
dQH->size_ioc_int_sts &= temp;
+ /* Ensure that updates to the QH will occure before priming. */
+ wmb();
+
/* Prime endpoint by writing 1 to ENDPTPRIME */
temp = ep_is_in(ep)
? (1 << (ep_index(ep) + 16))