Re: [PATCH 1/7] iommu/omap: Do bus_set_iommu() only if probe() succeeds

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




Hi Suman,

So back to this...

On 12/24/2013 12:35 AM, Anna, Suman wrote:
> Hi Florian,
> 

[...]

>>
>> If omap_iommu_probe() fails, the init will have called bus_set_iommu()
>> anyways. Thus, when a driver request the iommu by calling
>> iommu_domain_alloc(), it will succeed (but iommu_attach_device() will
>> fail if I remember).
> 
> Yeah, thats the behavior I expected anyway.
> 
>> Leaving a driver with a dangling reference to
>> a phantom iommu is not good IMHO. It will lead to strange behaviours
>> one day or another.
>>
>> As for the multiple iommu case, as I do not think it is currently
>> possible, as bus_type (in this case &platform_bus_type) has only
>> one struct iommu_ops. bus_set_iommu() will return EBUSY on the
>> second call. Am I missing something?
> 
> What I meant was the problem you cited will still exist, say if ISP MMU
> probe failed, but the IVA MMU probe succeeded. The bus_set_iommu() can
> only be called once anyway, so moving it from init to probe would not
> help much.
> 

Ok I see your point. Similar IPs share the same ops, but with different
omap_iommu_arch_data, even if currently we only have one registered
IOMMU for OMAP3.

So I will drop this patch.

Regards,
Florian
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux