linux-kernel - RE: [PATCH v5 2/9] iommu: Replace sva_iommu with iommu_attach

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Date: Wed, 15 May 2024 07:21:23 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Jason Gunthorpe <jgg@...pe.ca>,
	"Joerg Roedel" <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy
	<robin.murphy@....com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Nicolin Chen <nicolinc@...dia.com>, "Liu, Yi L" <yi.l.liu@...el.com>, "Jacob
 Pan" <jacob.jun.pan@...ux.intel.com>, Joel Granados <j.granados@...sung.com>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"virtualization@...ts.linux-foundation.org"
	<virtualization@...ts.linux-foundation.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 2/9] iommu: Replace sva_iommu with iommu_attach_handle

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, April 30, 2024 10:57 PM
> 
>  #else
> -static inline struct iommu_sva *
> +static inline struct iommu_attach_handle *
>  iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
>  {
> -	return NULL;
> +	return ERR_PTR(-ENODEV);
>  }
> 

this should be a separate fix.

existing drivers (idxd and uacce) only check IS_ERR() on the return
value. A Null pointer may lead to an error reported at a later point.