On Fri, Jan 27, 2023 at 12:37:35PM -0600, Rob Herring wrote: > Looks to me like we are leaking 'r' with this change.
Oh, probably now that you mention it. Usually the OF code keeps
track of more things than I expect...
> Wouldn't this change work:
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index c34ac33b7338..f43311f01c32 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -968,6 +968,11 @@ int of_dma_get_range(struct device_node *np,
> const struct bus_dma_region **map)
> for_each_of_range(&parser, &range)
> num_ranges++;
>
> + if (!num_ranges) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
Not as-is, there is a range counted by that first loop but it's
then rejected by the check in the second loop for cpu_addr ==
OF_BAD_ADDR. We'd need to add a similar check in the first loop.
It should work otherwise though and avoids doing the allocation
in this case.
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