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pmdomain: mtk-pm-domains: Fix spinlock recursion fix in probe

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Remove scpsys_get_legacy_regmap(), replacing its usage with
of_find_node_with_property(). Explicitly call of_node_get(np) before each
of_find_node_with_property() to maintain correct node reference counting.

The of_find_node_with_property() function "consumes" its input by calling
of_node_put() internally, whether or not it finds a match.  Currently,
dev->of_node (np) is passed multiple times in sequence without incrementing
its reference count, causing it to be decremented multiple times and
risking early memory release.

Adding of_node_get(np) before each call balances the reference count,
preventing premature node release.

Fixes: c1bac49fe91f ("pmdomains: mtk-pm-domains: Fix spinlock recursion in probe")
Cc: stable@vger.kernel.org
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Tested-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Macpaul Lin 2025-11-28 12:17:22 +08:00 committed by Ulf Hansson
parent f8f9c1f4d0
commit 305f254727
1 changed files with 6 additions and 15 deletions
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21
drivers/pmdomain/mediatek/mtk-pm-domains.c
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@ -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++;