linux-kernel - RE: [PATCH v2 05/12] iommu: Change the return value of dev_iommu

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Date:   Thu, 3 Aug 2023 07:59:56 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        "Jason Gunthorpe" <jgg@...pe.ca>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 05/12] iommu: Change the return value of
 dev_iommu_get()

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Thursday, July 27, 2023 1:49 PM
> 
> Make dev_iommu_get() return 0 for success and error numbers for failure.
> This will make the code neat and readable. No functionality changes.
> 
> Reviewed-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/iommu.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 00309f66153b..4ba3bb692993 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -290,20 +290,20 @@ void iommu_device_unregister(struct
> iommu_device *iommu)
>  }
>  EXPORT_SYMBOL_GPL(iommu_device_unregister);
> 
> -static struct dev_iommu *dev_iommu_get(struct device *dev)
> +static int dev_iommu_get(struct device *dev)
>  {
>  	struct dev_iommu *param = dev->iommu;
> 
>  	if (param)
> -		return param;
> +		return 0;
> 
>  	param = kzalloc(sizeof(*param), GFP_KERNEL);
>  	if (!param)
> -		return NULL;
> +		return -ENOMEM;
> 
>  	mutex_init(&param->lock);
>  	dev->iommu = param;
> -	return param;
> +	return 0;
>  }
> 

Jason's series [1] has been queued. Time to refine according to
the discussion in [2].

[1] https://lore.kernel.org/linux-iommu/ZLFYXlSBZrlxFpHM@8bytes.org/
[2] https://lore.kernel.org/linux-iommu/c815fa2b-00df-91e1-8353-8258773957e4@linux.intel.com/