target/linux/bcm27xx/patches-5.4/950-0442-of-address-Follow-DMA-parent-for-dma-coherent.patch

   1 From e4a649779ff6857240fe691cdf147a3b4896e71b Mon Sep 17 00:00:00 2001
   2 From: Robin Murphy <robin.murphy@arm.com>
   3 Date: Wed, 3 Jul 2019 14:47:31 +0100
   4 Subject: [PATCH] of: address: Follow DMA parent for "dma-coherent"
   5
   6 commit c60bf3eb888a362100aa1bdbea351dab681e262a upstream.
   7
   8 Much like for address translation, when checking for DMA coherence we
   9 should be sure to walk up the DMA hierarchy, rather than the MMIO one,
  10 now that we can accommodate them being different.
  11
  12 Signed-off-by: Robin Murphy <robin.murphy@arm.com>
  13 Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  14 Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  15 Signed-off-by: Rob Herring <robh@kernel.org>
  16 ---
  17  drivers/of/address.c | 2 +-
  18  1 file changed, 1 insertion(+), 1 deletion(-)
  19
  20 --- a/drivers/of/address.c
  21 +++ b/drivers/of/address.c
  22 @@ -1023,7 +1023,7 @@ bool of_dma_is_coherent(struct device_no
  23                         of_node_put(node);
  24                         return true;
  25                 }
  26 -               node = of_get_next_parent(node);
  27 +               node = of_get_next_dma_parent(node);
  28         }
  29         of_node_put(node);
  30         return false;