linux-kernel - Re: USB: FIx locks and urb->status in adutux

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Date:	Wed, 24 Oct 2007 16:04:42 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	linux-usb-devel@...ts.sourceforge.net, greg@...ah.com,
	linux-kernel@...r.kernel.org, vitalivanov@...il.com,
	netwiz@....id.au
Subject: Re: USB: FIx locks and urb->status in adutux

Am Dienstag 23 Oktober 2007 schrieb Pete Zaitcev:
> On Tue, 23 Oct 2007 11:38:37 +0200, Oliver Neukum <oliver@...kum.org> wrote:
> 
> > > +   /* XXX Anchor these instead */
> > > +   spin_lock_irqsave(&dev->buflock, flags);
> > > +   if (!dev->read_urb_finished) {
> > > +           spin_unlock_irqrestore(&dev->buflock, flags);
> > > +           usb_kill_urb(dev->interrupt_in_urb);
> > > +   } else
> > > +           spin_unlock_irqrestore(&dev->buflock, flags);
> 
> > Why bother? Simply call usb_kill_urb() unconditionally.
> 
> Is it always safe to kill unfilled URBs? The filled but unsubmitted ones
> are ok, but in this case it's possible that we only allocated something
> but never submitted. Our current implementation happens to be safe by
> virtue of ->dev being NULL in such case. I do not remember if we always
> guaranteed that and since Vitaly is going to take this code for a
> backport, I decided to play it safe.

I am not sure as far as 2.4 is concerned. In fact I am not sure 2.4 has
usb_kill_urb() at all.

	Regards
		Oliver

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