linux-kernel - Re: All 2.6.26-rcX hang immediately after loading ohci

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Date:	Fri, 11 Jul 2008 10:16:26 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Brownell <david-b@...bell.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: All 2.6.26-rcX hang immediately after loading ohci_hcd

[If nobody minds, after this message I will remove everything except 
linux-usb from the CC: list.]

On Fri, 11 Jul 2008, Andrey Borzenkov wrote:

> On Sunday 06 July 2008, Alan Stern wrote:
> > There doesn't seem to be much choice.
> > 
> > As I recall, the consequences of leaving the old code were that 
> > sometimes a suspend or a resume wouldn't work as expected.  That's 
> > better than hanging the entire system -- but on the other hand, it 
> > would affect more people.
> > 
> > Andrey, when you have time I'd like to do some more debugging to find 
> > out exactly what's going wrong.
> >
> 
> Let me know what you need. I am still running rc8 but may update if needed.

That's good; it'll help initially to test a system with the bug 
present.

To start with, add a printk near the start of ohci_irq() in ohci-hcd.c.  
Have it display in hex the value of "ints", immediately after the 
ohci_readl() call.

Alan Stern

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