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

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Date:	Mon, 18 Jan 2010 22:32:47 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Thomas Gleixner <tglx@...utronix.de>
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?

On Mon, 18 Jan 2010, Thomas Gleixner wrote:

> 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. 

OK, I sem to have missed that message.

> > /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.

There is another one later in the function:

msleep(5);/* 5ms for HCD enter low pwr mode */

In my linux-next, it is on line 181.

julia
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