From 39f5d9e883393e32938eac45b564f74afde8a942 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Wed, 4 Sep 2019 11:43:30 +0100 Subject: [PATCH] of/address: Translate 'dma-ranges' for parent nodes missing 'dma-ranges' commit 81db12ee15cb83926e290a8a3654a2dfebc80935 upstream. 'dma-ranges' frequently exists without parent nodes having 'dma-ranges'. While this is an error for 'ranges', this is fine because DMA capable devices always have a translatable DMA address. Also, with no 'dma-ranges' at all, the assumption is that DMA addresses are 1:1 with no restrictions unless perhaps the device itself has implicit restrictions. Cc: Robin Murphy Tested-by: Nicolas Saenz Julienne Reviewed-by: Nicolas Saenz Julienne Signed-off-by: Rob Herring --- drivers/of/address.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -519,9 +519,13 @@ static int of_translate_one(struct devic * * As far as we know, this damage only exists on Apple machines, so * This code is only enabled on powerpc. --gcl + * + * This quirk also applies for 'dma-ranges' which frequently exist in + * child nodes without 'dma-ranges' in the parent nodes. --RobH */ ranges = of_get_property(parent, rprop, &rlen); - if (ranges == NULL && !of_empty_ranges_quirk(parent)) { + if (ranges == NULL && !of_empty_ranges_quirk(parent) && + strcmp(rprop, "dma-ranges")) { pr_debug("no ranges; cannot translate\n"); return 1; } ype='submit' value='switch'/> upstream openwrtJames
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