linux-kernel - Re: [PATCH 12/12] usb: use IRQ watching

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Date:	Mon, 14 Jun 2010 15:11:24 -0700
From:	Greg KH <gregkh@...e.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	mingo@...e.hu, tglx@...utronix.de, bphilips@...e.de,
	yinghai@...nel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jeff@...zik.org, linux-ide@...r.kernel.org,
	stern@...land.harvard.edu, khali@...ux-fr.org
Subject: Re: [PATCH 12/12] usb: use IRQ watching

On Mon, Jun 14, 2010 at 11:52:10PM +0200, Tejun Heo wrote:
> Hello,
> 
> On 06/14/2010 11:41 PM, Greg KH wrote:
> > So if there's a routing problem, it turns into a polled interrupt?  Do
> > we really want that?
> 
> Oh yeah, I really want that for libata.  Routing is only part of the
> problem and flaky IRQ is something we have to learn to cope with.
> 
> > I wonder how long people will run without realizing that there are
> > problems with their system if their devices still work.
> 
> I think things would be better this way.  If the drives (both cd and
> hard) / input devices are not accessible, most people would simply
> give up rather than reporting, and many cases are transient problems
> which happen only once in the blue moon.
> 
> It would be great if some kind of automatic reporting can be used
> (similar to kerneloops?).  Hmm... maybe make the warnings scarier?

If you throw a WARN(), then kerneloops will pick it up, so you should be
fine there.

thanks,

greg k-h
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