Re: mcs7830 usb net: "scheduling while atomic" danger?

[Arnd Bergmann <arnd@arndb.de>]

On Monday 18 January 2010, Julia Lawall wrote:
> > That code looks indeed broken as was added las July as part of 331ac6b288d9
> > "USB: EHCI: Add Intel Moorestown EHCI controller HOSTPCx extensions and
> > support phy low power mode". The reason that this hasn't triggered is
> > probably the lack of Moorestown machines in the field.
> 
> The fix is just msleep -> mdelay?

No, that would just kill the warning but still leave horrible code. There
should really be some way to move the sleeping operation outside of the
spinlock.

>From a brief look at the code, I think the sequence could be converted
from

lock();
suspend();
sleep();
clock_disable();
unlock();

to

lock();
again:
suspend();
unlock();
sleep();
lock();
if (!suspended())
   goto again;
clock_disable();
unlock();

	Arnd