linux-kernel - Re: [PATCH v2 09/10] iommu: Use dev_iommu

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Message-ID: <YgNi3unEVewqJtaL@infradead.org>
Date:   Tue, 8 Feb 2022 22:44:46 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/10] iommu: Use dev_iommu_ops() helper

On Tue, Feb 08, 2022 at 09:25:58AM +0800, Lu Baolu wrote:
> Convert all the feasible instances of dev->bus->iommu_ops to
> dev_iommu_ops() in order to making the operation of obtaining
> iommu_ops from a device consistent.

I'm not a native speaker, but I think this should read ".. in order to
make .."

>  void iommu_get_resv_regions(struct device *dev, struct list_head *list)
>  {
> -	const struct iommu_ops *ops = dev->bus->iommu_ops;
> +	const struct iommu_ops *ops = dev_iommu_ops(dev);
>  
>  	if (ops && ops->get_resv_regions)

dev_iommu_ops warns on a NULL ops, so we either don'tneed the ops check
here or have another problem.

Same in a few more spots.