Re: [Xen-devel] [PATCH 3/6] x86/vtd: Drop struct qi_ctrl

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Saturday, February 23, 2019 3:13 AM
> 
> It is unclear why this abstraction exists, but iommu_qi_ctrl() returns
> possibly NULL and every user unconditionally dereferences the result.  In
> practice, I can't spot a path where iommu is NULL, so I think it is mostly
> dead.
> 
> Move the sole member into struct vtd_iommu, and delete iommu_qi_ctrl().
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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