Hi Bjorn,

On 5/17/2017 10:34 PM, Bjorn Helgaas wrote:

On Wed, May 17, 2017 at 05:00:07PM +0530, Sricharan R wrote:

quoted

Now with iommu probe deferral, we return -EPROBE_DEFER
for master's that are connected to an iommu which is not

s/master's/masters/

s/iommu/IOMMU/ in your English text (changelogs and comments).  That seems
to be the convention, based on "git log drivers/iommu/of_iommu.c"

ok, will correct those.

Regards,
 Sricharan

quoted

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 <redacted>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Will Deacon <redacted>
Tested-by: Magnus Damn <redacted>
Acked-by: Will Deacon <redacted>
---
 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;
 

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel at lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
"QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation