This patch (as1671) fixes up an incorrect resolution of a merge
conflict between Greg KH's usb-linus branch and his usb-next branch.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/ehci-timer.c | 9 +++++++++
1 file changed, 9 insertions(+)
Index: usb-3.9/drivers/usb/host/ehci-timer.c
===================================================================
--- usb-3.9.orig/drivers/usb/host/ehci-timer.c
+++ usb-3.9/drivers/usb/host/ehci-timer.c
@@ -297,6 +297,15 @@ static void ehci_iaa_watchdog(struct ehc
{
u32 cmd, status;
+ /*
+ * Lost IAA irqs wedge things badly; seen first with a vt8235.
+ * So we need this watchdog, but must protect it against both
+ * (a) SMP races against real IAA firing and retriggering, and
+ * (b) clean HC shutdown, when IAA watchdog was pending.
+ */
+ if (ehci->rh_state != EHCI_RH_RUNNING)
+ return;
+
/* If we get here, IAA is *REALLY* late. It's barely
* conceivable that the system is so busy that CMD_IAAD
* is still legitimately set, so let's be sure it's
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