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SubjectRe: [PATCH v3 15/15] iommu: Clean up bus_set_iommu()
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On 7/7/22 8:49 AM, Matthew Rosato wrote:
> On 7/5/22 1:08 PM, Robin Murphy wrote:
>> Clean up the remaining trivial bus_set_iommu() callsites along
>> with the implementation. Now drivers only have to know and care
>> about iommu_device instances, phew!
>>
>> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
>> ---
>>
>> v3: Also catch Intel's cheeky open-coded assignment
>>
>
> ...
>
>> diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
>> index c898bcbbce11..dd957145fb81 100644
>> --- a/drivers/iommu/s390-iommu.c
>> +++ b/drivers/iommu/s390-iommu.c
>> @@ -385,9 +385,3 @@ static const struct iommu_ops s390_iommu_ops = {
>>           .free        = s390_domain_free,
>>       }
>>   };
>> -
>> -static int __init s390_iommu_init(void)
>> -{
>> -    return bus_set_iommu(&pci_bus_type, &s390_iommu_ops);
>> -}
>> -subsys_initcall(s390_iommu_init);
>
> Previously s390_iommu_ops was only being set for pci_bus_type, but with
> this series it will now also be set for platform_bus_type.
>
> To tolerate that, this series needs a change along the lines of:
>

... Sorry, let's try that again without a mangled diff:

From: Matthew Rosato <mjrosato@linux.ibm.com>

Date: Thu, 7 Jul 2022 08:45:44 -0400

Subject: [PATCH] iommu/s390: fail probe for non-pci device



s390-iommu only supports pci_bus_type today



Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>

---

drivers/iommu/s390-iommu.c | 7 ++++++-

1 file changed, 6 insertions(+), 1 deletion(-)



diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c

index dd957145fb81..762f892b4ec3 100644

--- a/drivers/iommu/s390-iommu.c

+++ b/drivers/iommu/s390-iommu.c

@@ -185,7 +185,12 @@ static void s390_iommu_detach_device(struct
iommu_domain *domain,


static struct iommu_device *s390_iommu_probe_device(struct device
*dev)
{

- struct zpci_dev *zdev = to_zpci_dev(dev);

+ struct zpci_dev *zdev;
+

+ if (!dev_is_pci(dev))
+ return ERR_PTR(-ENODEV);
+

+ zdev = to_zpci_dev(dev);


return &zdev->iommu_dev;
}
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