linux-kernel - Re: [PATCH] uio/gen-pci: don't enable interrupts in ISR

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Message-ID: <4E411D72.7000604@linutronix.de>
Date:	Tue, 09 Aug 2011 13:43:46 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Chris Wright <chrisw@...hat.com>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Anthony Foiani <anthony.foiani@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uio/gen-pci: don't enable interrupts in ISR

Michael S. Tsirkin wrote:
>> It seems to me that you could drop this "user block" thing
>> since you never change anything outside of this command register and it
>> does not stop the race.
> 
> I don't think so: if we did, we would lose userspace modifications to
> other bits such as io enable, and there's no way to guess what their
> values should be.

How so?

Sebastian
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