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pmdomain: core: Prevent registering devices before the bus

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We must not register a consumer device to the genpd bus, before registering
the bus itself. Even if this doesn't seem to be an issue, let's add a
simple check to make sure we really avoid this from happening.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20250701114733.636510-5-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson
2025-07-01 13:47:06 +02:00
parent b27e9842b8
commit 60fe1ca5bc
1 changed files with 13 additions and 1 deletions
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14
drivers/pmdomain/core.c
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@@ -2491,6 +2491,8 @@ struct of_genpd_provider {
static LIST_HEAD(of_genpd_providers);
/* Mutex to protect the list above. */
static DEFINE_MUTEX(of_genpd_mutex);
/* Used to prevent registering devices before the bus. */
static bool genpd_bus_registered;
/**
* genpd_xlate_simple() - Xlate function for direct node-domain mapping
@@ -3179,6 +3181,9 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
if (num_domains < 0 || index >= num_domains)
return NULL;
if (!genpd_bus_registered)
return ERR_PTR(-ENODEV);
/* Allocate and register device on the genpd bus. */
virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);
if (!virt_dev)
@@ -3357,7 +3362,14 @@ EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
static int __init genpd_bus_init(void)
{
return bus_register(&genpd_bus_type);
int ret;
ret = bus_register(&genpd_bus_type);
if (ret)
return ret;
genpd_bus_registered = true;
return 0;
}
core_initcall(genpd_bus_init);