linux-kernel - Re: [PATCH 2/3] x86: amd

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Date:	Wed, 3 Jun 2009 10:36:42 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	mingo@...e.hu, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] x86: amd_iommu, fix lock imbalance

On Thu, May 28, 2009 at 09:54:48AM +0200, Jiri Slaby wrote:
> In alloc_coherent there is an omitted unlock on the path where mapping
> fails. Add the unlock.
> 
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> Cc: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/kernel/amd_iommu.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> index a97db99..b123e20 100644
> --- a/arch/x86/kernel/amd_iommu.c
> +++ b/arch/x86/kernel/amd_iommu.c
> @@ -1537,8 +1537,10 @@ static void *alloc_coherent(struct device *dev, size_t size,
>  	*dma_addr = __map_single(dev, iommu, domain->priv, paddr,
>  				 size, DMA_BIDIRECTIONAL, true, dma_mask);
>  
> -	if (*dma_addr == bad_dma_address)
> +	if (*dma_addr == bad_dma_address) {
> +		spin_unlock_irqrestore(&domain->lock, flags);
>  		goto out_free;
> +	}
>  
>  	iommu_completion_wait(iommu);

Applied to amd-iommu/fixes. Thanks Jiri.

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