Re: [PATCH v5 2/9] iommu: Replace sva_iommu with iommu_attach_handle

[Baolu Lu]

On 5/15/24 3:21 PM, Tian, Kevin wrote:
> > From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> > 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.

Yes. It could be a 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.

Though I don't think it could cause any real problem because this
interface should always be called after the sva enabling one.

Best regards,
baolu