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thermal: netlink: Improve the initcall ordering 

The initcalls like to play joke. In our case, the thermal-netlink
initcall is called after the thermal-core initcall but this one sends
a notification before the former is initialized. No issue was spotted,
but it could lead to a memory corruption, so instead of relying on the
core_initcall for the thermal-netlink, let's initialize directly from
the thermal-core init routine, so we have full control of the init
ordering.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Link: https://lore.kernel.org/r/20200717164217.18819-1-daniel.lezcano@linaro.org
zero-sugar-mainline-defconfig
Daniel Lezcano 2020-07-17 18:42:16 +02:00
parent c62e7ac395
commit d2a89b5283
3 changed files with 11 additions and 2 deletions
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4
drivers/thermal/thermal_core.c
View File

@ -1640,6 +1640,10 @@ static int __init thermal_init(void)
{
int result;
result = thermal_netlink_init();
if (result)
goto error;
mutex_init(&poweroff_lock);
result = thermal_register_governors();
if (result)

3
drivers/thermal/thermal_netlink.c
View File

@ -641,8 +641,7 @@ static struct genl_family thermal_gnl_family __ro_after_init = {
.n_mcgrps = ARRAY_SIZE(thermal_genl_mcgrps),
};
static int __init thermal_netlink_init(void)
int __init thermal_netlink_init(void)
{
return genl_register_family(&thermal_gnl_family);
}
core_initcall(thermal_netlink_init);

6
drivers/thermal/thermal_netlink.h
View File

@ -6,6 +6,7 @@
/* Netlink notification function */
#ifdef CONFIG_THERMAL_NETLINK
int __init thermal_netlink_init(void);
int thermal_notify_tz_create(int tz_id, const char *name);
int thermal_notify_tz_delete(int tz_id);
int thermal_notify_tz_enable(int tz_id);
@ -23,6 +24,11 @@ int thermal_notify_cdev_delete(int cdev_id);
int thermal_notify_tz_gov_change(int tz_id, const char *name);
int thermal_genl_sampling_temp(int id, int temp);
#else
static inline int thermal_netlink_init(void)
{
return 0;
}
static inline int thermal_notify_tz_create(int tz_id, const char *name)
{
return 0;