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authorWill Newton <will.newton@gmail.com>2008-08-12 15:39:16 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 14:41:07 -0700
commit59097fb73cf60276053551308524f6c772f305a9 (patch)
treeac240300da3c23d3536ad3cec3eee0f27a71b0bb /drivers/usb
parent224b50390104af7602871894540d94cc759dc4c0 (diff)
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/fsl_usb2_udc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
index 6f627203134..0492441bc0b 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_usb2_udc.c
@@ -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))