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Date: Mon, 21 May 2007 11:44:37 +0900
From: Mattia Dongili <malattia@linux.it>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Stuart Hayes <stuart_hayes@dell.com>,
       David Brownell <dbrownell@users.sourceforge.net>,
       Greg Kroah-Hartman <gregkh@suse.de>
Subject: [2.6.22-rc1-mm1] ehci-hcd - BUG: scheduling while atomic: rmmod/0x00000001/4568
Message-ID: <20070521024437.GA4751@inferi.kami.home>
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Hello,

with gregkh-usb-usb-ehci-cpufreq-fix.patch removing ehci-hcd causes the
following BUG:
[  459.800033] BUG: scheduling while atomic: rmmod/0x00000001/4568
[  459.800045]  [<c0104eb3>] dump_trace+0x63/0x1ec
[  459.800055]  [<c0105056>] show_trace_log_lvl+0x1a/0x30
[  459.800066]  [<c0105c82>] show_trace+0x12/0x14
[  459.800099]  [<c0105d0f>] dump_stack+0x16/0x18
[  459.800135]  [<c02eff66>] __sched_text_start+0x56/0x7db
[  459.800142]  [<c02f0768>] wait_for_completion+0x65/0x9b
[  459.800147]  [<c0132c38>] synchronize_rcu+0x2d/0x33
[  459.800154]  [<c0138387>] synchronize_srcu+0x23/0x5f
[  459.800160]  [<c012f6bf>] srcu_notifier_chain_unregister+0x43/0x4d
[  459.800185]  [<c0287b83>] cpufreq_unregister_notifier+0x22/0x32
[  459.800203]  [<f8e85713>] ehci_stop+0x4f/0xb7 [ehci_hcd]
[  459.800248]  [<f8dc48d4>] usb_remove_hcd+0x97/0xd7 [usbcore]
[  459.800280]  [<f8dcdf1d>] usb_hcd_pci_remove+0x18/0x6a [usbcore]
[  459.800317]  [<c01f1ca3>] pci_device_remove+0x1c/0x3d
[  459.800324]  [<c024fc46>] __device_release_driver+0x74/0x90
[  459.800332]  [<c025009f>] driver_detach+0x81/0xc2
[  459.800337]  [<c024f7f9>] bus_remove_driver+0x5d/0x7c
[  459.800342]  [<c025010a>] driver_unregister+0xb/0xd
[  459.800347]  [<c01f1e1d>] pci_unregister_driver+0x13/0x65
[  459.800351]  [<f8e858f8>] ehci_hcd_cleanup+0x10/0x12 [ehci_hcd]
[  459.800360]  [<c0143b11>] sys_delete_module+0x187/0x1ae
[  459.800367]  [<c0103e62>] sysenter_past_esp+0x5f/0x85
[  459.800373]  [<ffffe410>] 0xffffe410
[  459.800384]  =======================

static void ehci_stop (struct usb_hcd *hcd)
{
	...
	spin_lock_irq(&ehci->lock);
	if (HC_IS_RUNNING (hcd->state))
		ehci_quiesce (ehci);

#ifdef CONFIG_CPU_FREQ
	cpufreq_unregister_notifier(&ehci->cpufreq_transition,
				    CPUFREQ_TRANSITION_NOTIFIER);
#endif

-- 
mattia
:wq!
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