On Fri, 25 May 2007 14:40:05 -0700 Greg KH <[email protected]> wrote:
> On Mon, May 21, 2007 at 11:44:37AM +0900, Mattia Dongili wrote:
> > Hello,
> >
> > with gregkh-usb-usb-ehci-cpufreq-fix.patch removing ehci-hcd causes the
> > following BUG:
>
> Thanks for letting me know.
>
> Stuart, any help here?
pretty obvious. cpufreq_unregister_notifier() sleeps, and that patch
causes it to be called under spinlock.
Something like this...
--- a/drivers/usb/host/ehci-hcd.c~fix-gregkh-usb-usb-ehci-cpufreq-fix
+++ a/drivers/usb/host/ehci-hcd.c
@@ -452,14 +452,14 @@ static void ehci_stop (struct usb_hcd *h
if (HC_IS_RUNNING (hcd->state))
ehci_quiesce (ehci);
-#ifdef CONFIG_CPU_FREQ
- cpufreq_unregister_notifier(&ehci->cpufreq_transition,
- CPUFREQ_TRANSITION_NOTIFIER);
-#endif
ehci_reset (ehci);
ehci_writel(ehci, 0, &ehci->regs->intr_enable);
spin_unlock_irq(&ehci->lock);
+#ifdef CONFIG_CPU_FREQ
+ cpufreq_unregister_notifier(&ehci->cpufreq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+#endif
/* let companion controllers work when we aren't */
ehci_writel(ehci, 0, &ehci->regs->configured_flag);
_
-
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