linux-kernel - Re: mcs7830 usb net: "scheduling while atomic" danger?

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Date:	Mon, 18 Jan 2010 22:24:12 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Julia Lawall <julia@...u.dk>
cc:	Andreas Mohr <andi@...as.de>, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>
Subject: Re: mcs7830 usb net: "scheduling while atomic" danger?

Julia,

On Mon, 18 Jan 2010, Julia Lawall wrote:
> On Mon, 18 Jan 2010, Andreas Mohr wrote:
>
> The semantic match shown below finds 55 matches.  All but two involve 
> mutex_lock.  Those are in the file 

As I said before the mutex_lock()/msleep() ones are fine. 

> /var/linuxes/linux-next/drivers/usb/host/ehci-hub.c
> in the functions ehci_bus_suspend and ehci_hub_control.

The msleep in ehci_hub_control() which happens with ehci->lock held
and irqs disabled is definitely buggy.

I can't see anything wrong wth the msleep in ehci_bus_suspend() as it
is _before_ the spin_lock_irq(&ehci->lock) region.

Thanks,

	tglx
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