linux-kernel - Re: pci_get_dev_by_id() from interrupt handlers

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Message-ID: <1271845271.1776.74.camel@laptop>
Date:	Wed, 21 Apr 2010 12:21:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Greg KH <greg@...ah.com>, Joerg Roedel <joro@...tes.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: pci_get_dev_by_id() from interrupt handlers

On Wed, 2010-04-21 at 12:05 +0200, Joerg Roedel wrote:
> 
> > Why not do the whole thing in an interrupt task as the whole thing
> > sounds like something that shouldn't be done in interrupt context,
> > right?  Now that we have this type of functionality, we should take
> > advantage of it :)
> 
> Ok, I think I move the IOMMU interrupt handling to a tasklet.
> 
tasklet is softirq context, and is not what gregkh was talking about.

You'd still need to change the klist spinlock to be softirq-safe.

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