Messages in this thread Patch in this message |  | | From | Macpaul Lin <> | | Subject | [PATCH] pmdomains: mtk-pm-domains: improve spinlock recursion fix in probe | | Date | Tue, 25 Nov 2025 18:56:17 +0800 |
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Remove scpsys_get_legacy_regmap() and update usages with of_find_node_with_property(). Use an explicit of_node_get(np) to ensure correct node referencing against of_node_put() and ensuring it is called in a safe context (i.e., not while holding devtree_lock).
If fwnode_count_parents() obtains parent nodes via fwnode_for_each_parent_node() and this process requires device tree operations, it may result in repeated acquisition of devtree_lock in the same thread/context, leading to spinlock recursion errors.
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- drivers/pmdomain/mediatek/mtk-pm-domains.c | 21 ++++++--------------- 1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.c b/drivers/pmdomain/mediatek/mtk-pm-domains.c index 80561d27f2b2..f64f24d520dd 100644 --- a/drivers/pmdomain/mediatek/mtk-pm-domains.c +++ b/drivers/pmdomain/mediatek/mtk-pm-domains.c @@ -984,18 +984,6 @@ static void scpsys_domain_cleanup(struct scpsys *scpsys) } } -static struct device_node *scpsys_get_legacy_regmap(struct device_node *np, const char *pn) -{ - struct device_node *local_node; - - for_each_child_of_node(np, local_node) { - if (of_property_present(local_node, pn)) - return local_node; - } - - return NULL; -} - static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *scpsys) { const u8 bp_blocks[3] = { @@ -1017,7 +1005,8 @@ static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *s * this makes it then possible to allocate the array of bus_prot * regmaps and convert all to the new style handling. */ - node = scpsys_get_legacy_regmap(np, "mediatek,infracfg"); + of_node_get(np); + node = of_find_node_with_property(np, "mediatek,infracfg"); if (node) { regmap[0] = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg"); of_node_put(node); @@ -1030,7 +1019,8 @@ static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *s regmap[0] = NULL; } - node = scpsys_get_legacy_regmap(np, "mediatek,smi"); + of_node_get(np); + node = of_find_node_with_property(np, "mediatek,smi"); if (node) { smi_np = of_parse_phandle(node, "mediatek,smi", 0); of_node_put(node); @@ -1048,7 +1038,8 @@ static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *s regmap[1] = NULL; } - node = scpsys_get_legacy_regmap(np, "mediatek,infracfg-nao"); + of_node_get(np); + node = of_find_node_with_property(np, "mediatek,infracfg-nao"); if (node) { regmap[2] = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg-nao"); num_regmaps++; -- 2.45.2
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