linux-kernel - Re: [patch] xenfb: fix xenfb suspend/resume race

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Message-ID: <4D2579F1.50900@oracle.com>
Date:	Thu, 06 Jan 2011 16:14:41 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Ian Campbell <Ian.Campbell@...citrix.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gurudas.pai@...cle.com" <gurudas.pai@...cle.com>,
	"greg.marsden@...cle.com" <greg.marsden@...cle.com>,
	"guru.anbalagane@...cle.com" <guru.anbalagane@...cle.com>
Subject: Re: [patch] xenfb: fix xenfb suspend/resume race


> 
> No, it papers over the issue, the code should never have been allowed to
> get this far if the connection to the backend is not yet fully resumed
> (i.e. when irq == -1).
> 
> The call to xenfb_send_event should have been gated further up the call
> chain, AFAICT by the check of info->update_wanted in xenfb_refresh. This
> suggests that the correct fix is to set info->update_wanted = 0 in
> xenfb_resume.
> 
> I said all this in my previous mail and you ignored it. Did you try this
> approach?

Will try this then update you.

Thanks,
Joe
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