diff options
| author | Jay Cheng <jacheng@nvidia.com> | 2010-10-27 11:45:19 -0400 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:36:34 -0800 |
| commit | e849e2c1de2e3a2882b6a35c3b658e15b46d7a86 (patch) | |
| tree | 22fd38ffd33574cdd1375970dbe66d08b79babc7 | |
| parent | edb8ab793c7a9f27fe9947d18a7c845ae018e69e (diff) | |
usb: host: ehci: Add missed memory barrier in the hcd driver
There is one wmb missing in the usb host controller driver after the queue head
update. Due to this data transaction is not happening on the bus after urb
submission by the hcd driver. Register updates/queue heads data in the memory
is not reflected on the AHB bus. After adding the wmb after queue head update
data transaction the USB bus started with out any delay.
originally fixed by Venkat Moganty <vmoganty@nvidia.com>
Change-Id: Ic834df5172ac2f2eb3bced317d38b4a2e7a44801
Signed-off-by: Jay Cheng <jacheng@nvidia.com>
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index 0917e3a32465..bd7ffe00fb62 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -998,6 +998,7 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) qh_get(qh); qh->xacterrs = 0; qh->qh_state = QH_STATE_LINKED; + wmb(); /* qtd completions reported later by interrupt */ } |