iommu/of: Free fwspec on probe deferrel

For devices with multiple iommus of_iommu_configure_device() potentially
inits the fwspec for one of the iommus but another iommu device might
have not yet been probe resulting in -EPROBE_DEFER. Clear the fwspec in
such cases to ensure the next of_iommu_configure() call retries to
configure all iommus.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/iommu/of_iommu.c

@@ -147,6 +147,8 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np,
 		of_pci_check_device_ats(dev, master_np);
 	} else {
 		err = of_iommu_configure_device(master_np, dev, id);
+		if (err == -EPROBE_DEFER)
+			iommu_fwspec_free(dev);
 	}
 
 	if (err)