[patch 2.6.23-rc3 3/4] EHCI cpufreq, handle broken notifications

From: Stuart Hayes <[email protected]>

This patch fixes a potential problem with the CPU frequency change
notification code in the EHCI driver.  The code counts the number of
change notifications, incrementing on PRECHANGE and decrementing on
POSTCHANGE events.

The problem is in the unlikely event that the notifier is registered
during a frequency change, and never gets the PRECHANGE notification.
The fix is to ignore unmatched POSTCHANGE events.

Signed-off-by: Stuart Hayes <[email protected]>
Signed-off-by: David Brownell <[email protected]>
---
 drivers/usb/host/ehci-hcd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- g26.orig/drivers/usb/host/ehci-hcd.c	2007-08-17 22:45:28.000000000 -0700
+++ g26/drivers/usb/host/ehci-hcd.c	2007-08-17 22:54:23.000000000 -0700
@@ -299,7 +299,7 @@ static void ehci_cpufreq_unpause (struct
 	unsigned long	flags;
 
 	spin_lock_irqsave(&ehci->lock, flags);
-	if (!--ehci->cpufreq_changing)
+	if (ehci->cpufreq_changing && !--ehci->cpufreq_changing)
 		qh_reactivate_split_intr_qhs(ehci);
 	spin_unlock_irqrestore(&ehci->lock, flags);
 }

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