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Date:   Wed, 18 Oct 2023 16:04:05 -0700
From:   Jerry Snitselaar <>
To:     Robin Murphy <>
Subject: Re: [PATCH v5 1/7] iommu: Factor out some helpers

On Wed, Oct 11, 2023 at 07:14:48PM +0100, Robin Murphy wrote:
> The pattern for picking the first device out of the group list is
> repeated a few times now, so it's clearly worth factoring out, which
> also helps hide the iommu_group_dev detail from places that don't need
> to know. Similarly, the safety check for dev_iommu_ops() at certain
> public interfaces starts looking a bit repetitive, and might not be
> completely obvious at first glance, so let's factor that out for clarity
> as well, in preparation for more uses of both.
> Reviewed-by: Lu Baolu <>
> Signed-off-by: Robin Murphy <>
> ---
> v3: Rename dev_iommu_ops_valid() to reflect what it's actually checking,
>     rather than an implied consequence.
> v4: Rebase, also catch the sneaky one in iommu_get_group_resv_regions()
>     which wasn't the full pattern (but really should be since it guards
>     the dev_iommu_ops() invocation in iommu_get_resv_regions()).
> ---

Reviewed-by: Jerry Snitselaar <>

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