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RE: [Xen-devel] x86 HPET MSI IRQs vs resume from S3

To: Jan Beulich <JBeulich@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] x86 HPET MSI IRQs vs resume from S3
From: "Li, Xin" <xin.li@xxxxxxxxx>
Date: Tue, 1 Feb 2011 10:36:02 +0800
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Hi Jan,
PRC are in Chinese New Year holiday, we will work on it after that.
Thanks!
-Xin

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jan Beulich
> Sent: Friday, January 28, 2011 5:24 PM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] x86 HPET MSI IRQs vs resume from S3
> 
> Going through hpet_broadcast_init(), I see that hpet_setup_msi_irq()
> gets called during resume, thus causing setup_irq() to be called. I'm
> failing to spot the corresponding release_irq(), and hence I can't see
> how this whole code path is supposed to work during resume (other
> than always falling back to using legacy_hpet_event). Instead I'm
> wondering whether in the resume case only msi_compose_msg()/
> hpet_msi_write() should be called for each IRQ used rather than the
> whole hpet_broadcast_init().
> 
> Thanks for any hints or pointers,
> Jan
> 
> 
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