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SubjectRE: [2.6.22-rc1-mm1] ehci-hcd - BUG: scheduling while atomic: rmmod/0x00000001/4568
Date
From

Sorry about that. Would it be helpful if I verified that and sent it in
signed off?

Thanks
Stuart

-----Original Message-----
From: Andrew Morton [mailto:akpm@linux-foundation.org]
Sent: Friday, May 25, 2007 5:00 PM
To: Greg KH
Cc: Mattia Dongili; Linux Kernel Mailing List; Hayes, Stuart; David
Brownell; linux-usb-devel@lists.sourceforge.net
Subject: Re: [2.6.22-rc1-mm1] ehci-hcd - BUG: scheduling while atomic:
rmmod/0x00000001/4568
On Fri, 25 May 2007 14:40:05 -0700 Greg KH <gregkh@suse.de> 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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