Re: [REGRESSION] 2.6.24/25: random lockups when accessing externalUSB harddrive

[Stefan Becker]

Hi,

ext Alan Stern wrote:
> On Wed, 25 Jun 2008, Stefan Becker wrote:
>
> > HCD URB list locked by usb_hcd_link_urb_to_ep!
> >
> > As far as I understand the matter this only can happen if 
> > usb_hcd_link_urb_to_ep() gets interrupted while holding the spinlock. 
> > But according to the contract at the header of the function it should be 
> > called with interrupts disabled!
>
> So it should.  Do you know how to test whether interrupts are enabled?  
> There's a routine called raw_irqs_disabled() defined in 
> include/asm/irqflags.h.  Stick it inside usb_hcd_link_urb_to_ep, and 
> the first time it returns nonzero, do a dump_stack().

Tried both and got nothing. So either our reasoning is wrong or 
something really weird is going on. I'll try to improve my debugging 
code and use dump_stack() at the place where it locks up.

Regards,

	Stefan

---
Stefan Becker
E-Mail: Stefan.Becker@xxxxxxxxx
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