[PATCH V4 1/4] iommu: of: Fix check for returning EPROBE_DEFER

[Sricharan R <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

Now with IOMMU probe deferral, we return -EPROBE_DEFER
for masters that are connected to an IOMMU which is not
probed yet, but going to get probed, so that we can attach
the correct dma_ops. So while trying to defer the probe of
the master, check if the of_iommu node that it is connected
to is marked in DT as 'status=disabled', then the IOMMU is never
is going to get probed. So simply return NULL and let the master
work without an IOMMU.

Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Signed-off-by: Sricharan R <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Reported-by: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
Tested-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Tested-by: Magnus Damn <magnus.damn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Acked-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
---
 drivers/iommu/of_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 9f44ee8..e6e9bec 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -118,6 +118,7 @@ static bool of_iommu_driver_present(struct device_node *np)
 
 	ops = iommu_ops_from_fwnode(fwnode);
 	if ((ops && !ops->of_xlate) ||
+	    !of_device_is_available(iommu_spec->np) ||
 	    (!ops && !of_iommu_driver_present(iommu_spec->np)))
 		return NULL;
 
-- 
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