linux-kernel - Re: [PATCH 02/13] iommu: Move bus setup to IOMMU device registration

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Date:   Sat, 16 Apr 2022 08:04:42 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Robin Murphy <robin.murphy@....com>, joro@...tes.org,
        will@...nel.org
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        sven@...npeter.dev, robdclark@...il.com, m.szyprowski@...sung.com,
        yong.wu@...iatek.com, mjrosato@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, zhang.lyra@...il.com,
        thierry.reding@...il.com, vdumpa@...dia.com,
        jean-philippe@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/13] iommu: Move bus setup to IOMMU device registration

On 2022/4/14 20:42, Robin Murphy wrote:
> @@ -1883,27 +1900,12 @@ static int iommu_bus_init(struct bus_type *bus)
>    */
>   int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
>   {
> -	int err;
> -
> -	if (ops == NULL) {
> -		bus->iommu_ops = NULL;
> -		return 0;
> -	}
> -
> -	if (bus->iommu_ops != NULL)
> +	if (bus->iommu_ops && ops && bus->iommu_ops != ops)
>   		return -EBUSY;
>   
>   	bus->iommu_ops = ops;

Do we still need to keep above lines in bus_set_iommu()?

Best regards,
baolu