linux-kernel - Re: [PATCH] iommu/amd: Fix amd_iommu_free

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Date:	Wed, 4 Feb 2015 15:35:21 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin LaHaise <bcrl@...ck.org>, linux-aio@...ck.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] iommu/amd: Fix amd_iommu_free_device()

On Tue, Feb 03, 2015 at 01:25:51PM +0100, Peter Zijlstra wrote:
> Subject: iommu/amd: Fix amd_iommu_free_device()
> 
> put_device_state_wait() doesn't loop on the condition and a spurious
> wakeup will have it free the device state even though there might still
> be references out to it.
> 
> Fix this by using 'normal' wait primitives.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  drivers/iommu/amd_iommu_v2.c | 20 +++++++-------------
>  1 file changed, 7 insertions(+), 13 deletions(-)

Applied this, thanks Peter.

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