This looks buggy to me: drivers/iommu/tegra-smmu.c::smmu_iommu_domain_init() spin_lock_irqsave(&tmp->lock, flags); <-- lock held, interrupts off alloc_pdir(as = tmp) devm_kzalloc(..., GFP_KERNEL); <-- potentially sleeping allocation ... alloc_page(..., GFP_KERNEL | __GFP_DMA); <-- same here thanks, -chris -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html