openwrt/target/linux/bcm27xx/patches-5.4/950-0430-of-address-Follow-DMA-parent-for-dma-coherent.patch

From e4a649779ff6857240fe691cdf147a3b4896e71b Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@arm.com>
Date: Wed, 3 Jul 2019 14:47:31 +0100
Subject: [PATCH] of: address: Follow DMA parent for "dma-coherent"

commit c60bf3eb888a362100aa1bdbea351dab681e262a upstream.

Much like for address translation, when checking for DMA coherence we
should be sure to walk up the DMA hierarchy, rather than the MMIO one,
now that we can accommodate them being different.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/of/address.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -1025,7 +1025,7 @@ bool of_dma_is_coherent(struct device_no
 			of_node_put(node);
 			return true;
 		}
-		node = of_get_next_parent(node);
+		node = of_get_next_dma_parent(node);
 	}
 	of_node_put(node);
 	return false;