linux-kernel - RE: [PATCH] ALSA: hda-intel - Disable MSI support by default

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Message-ID: <5986589C150B2F49A46483AC44C7BCA4907209@ssvlexmb2.amd.com>
Date:	Wed, 15 Nov 2006 20:25:01 -0800
From:	"Lu, Yinghai" <yinghai.lu@....com>
To:	"Lu, Yinghai" <yinghai.lu@....com>,
	"Olivier Nicolas" <olivn@...llprod.org>,
	"Linus Torvalds" <torvalds@...l.org>
cc:	"Mws" <mws@...sted-brains.org>, "Jeff Garzik" <jeff@...zik.org>,
	"Krzysztof Halasa" <khc@...waw.pl>,
	"David Miller" <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	tiwai@...e.de
Subject: RE: [PATCH] ALSA: hda-intel - Disable MSI support by default

I think the root cause in hda_intel driver's self.

It gets io-apic irq initialized at first, and it will use
azx_acquire_irq to install handler after check if MSI can be enabled.
And when it try to enable the MSI, that will start the int in the chip.
Even handler for MSI is not installed.

YH




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