Commit 59097fb7 authored Aug 12, 2008 by Will Newton Committed by Greg Kroah-Hartman Oct 17, 2008

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>

parent 224b5039

drivers/usb/gadget/fsl_usb2_udc.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -643,6 +643,9 @@ static void fsl_queue_td(struct fsl_ep ep, struct fsl_req req)
		\| 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))