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 linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
