From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: IRQs, move_in_progress, -EBUSY &c
Date: Wed, 11 Aug 2010 08:38:14 -0700
Message-ID: <4C62C3E6.4090606@goop.org>
References: <AANLkTin2Q9pH+v=Nm=T-R_sgajrdxKy5nj+_5Ja+Wb6Y@mail.gmail.com>
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To: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: xen-devel@lists.xensource.com, Keir Fraser <keir.fraser@eu.citrix.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
List-Id: xen-devel@lists.xenproject.org

  On 08/11/2010 07:56 AM, George Dunlap wrote:
> Going backwards to the root of the problem: The root device times out
> even though the device driver successfully loads and sees the device
> -- it complains about missing interrupts.  It misses interrupts
> because the PHYSDEVOP_setup_gsi returns -16, EBUSY, and the pvops
> kernel doesn't retry; so the gsi is never set up.

Aside from any of the other issues, EBUSY doesn't generally suggest that 
the caller should try again.  That would be EAGAIN.

     J