Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=59097f...
Commit: 59097fb73cf60276053551308524f6c772f305a9
Parent: 224b50390104af7602871894540d94cc759dc4c0
Author: Will Newton <will.newton@gmail.com>
AuthorDate: Tue Aug 12 15:39:16 2008 +0100
Committer: Greg Kroah-Hartman <gregkh@suse.de>
CommitDate: Fri Oct 17 14:41:07 2008 -0700
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>
---
drivers/usb/gadget/fsl_usb2_udc.c | 3 +++
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 6f62720..0492441 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))
--
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