linux-kernel - Re: [PATCH] usb ehci_iaa

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Date:	Wed, 2 Apr 2008 13:31:09 -0700
From:	David Brownell <david-b@...bell.net>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Mark Lord <lkml@....ca>, pavel@...e.cz, oliver@...kum.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	jikos@...e.cz, gregkh@...e.de, akpm@...ux-foundation.org
Subject: Re: [PATCH] usb ehci_iaa_watchdog fix

On Wednesday 02 April 2008, Alan Stern wrote:
> > -     if (ehci->reclaim
> > -                     && !timer_pending(&ehci->iaa_watchdog)
> > -                     && HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
> > +     if (ehci->reclaim && !timer_pending(&ehci->iaa_watchdog)) {
> >               u32 cmd, status;
> >  
> >               /* If we get here, IAA is *REALLY* late.  It's barely
> 
> Okay, I'm puzzled.  How could this make any difference?

It's more like:  what else in that patch could have had
any such effect?  That HC_IS_RUNNING test was the only
candidate.

Those hcd->state tests have been getting more and more
dodgey as time goes by.  At this point I hardly trust
any of them.  There *IS* no clear state machine which
governs the usbcore/HCD interaction.

- Dave


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