[PATCH 4.4 086/137] arm64: dma-mapping: fix handling of devices registered before arch_initcall

Greg Kroah-Hartman
2016-02-24T04:33:41Z

From: Marek Szyprowski <m.szyprowski@samsung.com>

commit 722ec35f7faefcc34d12616eca7976a848870f9d upstream.

This patch ensures that devices, which got registered before arch_initcall
will be handled correctly by IOMMU-based DMA-mapping code.

Fixes: 13b8629f6511 ("arm64: Add IOMMU dma_ops")
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/arm64/mm/dma-mapping.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -933,6 +933,10 @@ static int __init __iommu_dma_init(void)
ret = register_iommu_dma_ops_notifier(&platform_bus_type);
if (!ret)
ret = register_iommu_dma_ops_notifier(&amba_bustype);
+
+ /* handle devices queued before this arch_initcall */
+ if (!ret)
+ __iommu_attach_notifier(NULL, BUS_NOTIFY_ADD_DEVICE, NULL);
return ret;
}
arch_initcall(__iommu_dma_init);