On 1/10/25 16:50, Rob Herring (Arm) wrote:
> The recently added WARN() for deprecated #address-cells and #size-cells
> triggered a WARN when of_platform_populate() (which calls
> of_address_to_resource()) is used on nodes with non-translatable
> addresses. This case is expected to return an error.
>
> Rework the bus matching to allow no match and make the default require
> an #address-cells property. That should be safe to do as any platform
> missing #address-cells would have a warning already.
>
> Fixes: 045b14ca5c36 ("of: WARN on deprecated #address-cells/#size-cells
> handling")
> Signed-off-by: Rob Herring (Arm) <r...@kernel.org>
> ---
> drivers/of/address.c | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index c1f1c810e810..8770004d9b08 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -340,6 +340,15 @@ static int of_bus_default_flags_match(struct device_node
> *np)
> return of_property_present(np, "#address-cells") &&
> (of_bus_n_addr_cells(np) == 3);
> }
>
> +static int of_bus_default_match(struct device_node *np)
> +{
> + /*
> + * Check for presence first since of_bus_n_addr_cells() will warn when
> + * walking parent nodes.
> + */
> + return of_property_present(np, "#address-cells");
> +}
> +
> /*
> * Array of bus specific translators
> */
> @@ -384,7 +393,7 @@ static const struct of_bus of_busses[] = {
> {
> .name = "default",
> .addresses = "reg",
> - .match = NULL,
> + .match = of_bus_default_match,
> .count_cells = of_bus_default_count_cells,
> .map = of_bus_default_map,
> .translate = of_bus_default_translate,
> @@ -399,7 +408,6 @@ static const struct of_bus *of_match_bus(struct
> device_node *np)
> for (i = 0; i < ARRAY_SIZE(of_busses); i++)
> if (!of_busses[i].match || of_busses[i].match(np))
> return &of_busses[i];
> - BUG();
> return NULL;
> }
>
> @@ -521,6 +529,8 @@ static u64 __of_translate_address(struct device_node
> *node,
> if (parent == NULL)
> return OF_BAD_ADDR;
> bus = of_match_bus(parent);
> + if (!bus)
> + return OF_BAD_ADDR;
>
> /* Count address cells & copy address locally */
> bus->count_cells(dev, &na, &ns);
> @@ -564,6 +574,8 @@ static u64 __of_translate_address(struct device_node
> *node,
>
> /* Get new parent bus and counts */
> pbus = of_match_bus(parent);
> + if (!pbus)
> + return OF_BAD_ADDR;
> pbus->count_cells(dev, &pna, &pns);
> if (!OF_CHECK_COUNTS(pna, pns)) {
> pr_err("Bad cell count for %pOF\n", dev);
> @@ -703,7 +715,7 @@ const __be32 *__of_get_address(struct device_node *dev,
> int index, int bar_no,
>
> /* match the parent's bus type */
> bus = of_match_bus(parent);
> - if (strcmp(bus->name, "pci") && (bar_no >= 0))
> + if (!bus || (strcmp(bus->name, "pci") && (bar_no >= 0)))
> return NULL;
>
> /* Get "reg" or "assigned-addresses" property */
Tested-by: Sean Anderson <sean.ander...@linux.dev>
