linux-kernel - RE: [PATCH 6/7] iommu: Use right way to retrieve iommu

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Message-ID: <BN9PR11MB52761ADE7D2696DDF0388A6F8C5E9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Mon, 24 Jan 2022 09:48:36 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 6/7] iommu: Use right way to retrieve iommu_ops

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, January 24, 2022 3:11 PM
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index aa5486243892..111b3e9c79bb 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -385,6 +385,14 @@ static inline void iommu_iotlb_gather_init(struct
> iommu_iotlb_gather *gather)
>  	};
>  }
> 
> +static inline const struct iommu_ops *dev_iommu_ops_get(struct device
> *dev)

dev_get_iommu_ops or just dev_iommu_ops?

> +{
> +	if (dev && dev->iommu && dev->iommu->iommu_dev)
> +		return dev->iommu->iommu_dev->ops;
> +
> +	return NULL;
> +}