linux-kernel - Re: [PATCH] Intel IOMMU: fix sysfs leak in hotplug init path

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Date:   Thu, 22 Apr 2021 10:46:24 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Rolf Eike Beer <eb@...ix.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>
Cc:     baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Intel IOMMU: fix sysfs leak in hotplug init path

Hi Rolf,

On 4/21/21 11:12 PM, Rolf Eike Beer wrote:
> Signed-off-by: Rolf Eike Beer <eb@...ix.com>

Thanks for the patch!

Can you please adjust the subject to "iommu/vt-d: Fix sysfs leak in
alloc_domain()"? It's not only for hotplug path.

Please also add commit message.

Add below Fixes tag as well:

Fixes: 39ab9555c2411 ("iommu: Add sysfs bindings for struct iommu_device")

> ---
>   drivers/iommu/intel/dmar.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> I have not actually tested this but I guess it should match the code in
> free_iommu() just below.
> 
> diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
> index d5c51b5c20af..fb37a9b79b3a 100644
> --- a/drivers/iommu/intel/dmar.c
> +++ b/drivers/iommu/intel/dmar.c
> @@ -1144,7 +1144,7 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)
>   
>   		err = iommu_device_register(&iommu->iommu);
>   		if (err)
> -			goto err_unmap;
> +			goto err_unregister;
>   	}
>   
>   	drhd->iommu = iommu;
> @@ -1152,6 +1152,8 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)
>   
>   	return 0;
>   
> +err_unregister:
> +	iommu_device_sysfs_remove(&iommu->iommu);
>   err_unmap:
>   	unmap_iommu(iommu);
>   error_free_seq_id:
> 

Best regards,
baolu