[PATCH] arm: dma-mapping: Reset the device's dma_ops

[Sricharan R]

arch_teardown_dma_ops() being the inverse of arch_setup_dma_ops()
,dma_ops should be cleared in the teardown path. Otherwise
this causes problem when the probe of device is retried after
being deferred. The device's iommu structures are cleared
after EPROBEDEFER error, but on the next try dma_ops will still
be set to old value, which is not right.

Signed-off-by: Sricharan R <sricharan at codeaurora.org>
Reviewed-by: Robin Murphy <robin.murphy at arm.com>
---
 arch/arm/mm/dma-mapping.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index ab4f745..a40f03e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -2358,6 +2358,7 @@ static void arm_teardown_iommu_dma_ops(struct device *dev)
 
 	__arm_iommu_detach_device(dev);
 	arm_iommu_release_mapping(mapping);
+	set_dma_ops(dev, NULL);
 }
 
 #else
-- 
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