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Date:	Fri, 23 Aug 2013 09:30:52 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Liu Ping Fan <kernelfans@...il.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Kevin Hao <haokexin@...il.com>
Subject: Re: [PATCH] x86: ioapic needs check attr when programmed more than
 once


* Liu Ping Fan <kernelfans@...il.com> wrote:

> When programming ioapic pinX more than once, current code
> does not check whether the later attr (trigger&polarity) is the
> same as the former or not. This causes a broken semantic.
> 
> Fix it by reporting -EBUSY, when attr is different.

Was this observed in real life somehow, and if yes, what is 
the before/after behavior?

Thanks,

	Ingo
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