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authorAndrey Gelman <andreyg@compulab.co.il>2013-01-27 22:16:33 +0200
committerAnton Vorontsov <anton@enomsg.org>2013-03-18 19:27:31 -0700
commit9239ebcffb9301eab75c638dcb702688884cc5d6 (patch)
tree49d7c52c0abf730b9035de5d2a899400c3df1f91 /drivers/power
parent6f8da5df8c451103e0043f73a00c90676da6be9e (diff)
downloadlinux-linaro-stable-9239ebcffb9301eab75c638dcb702688884cc5d6.tar.gz
test_power: Fix a bug in setting module parameter values
When the kernel loads a module, module params are processed prior to calling module_init. As a result, setting module param value should not have side effects, at least as long as the module has not been initialized. Signed-off-by: Andrey Gelman <andreyg@compulab.co.il> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/test_power.c31
1 files changed, 21 insertions, 10 deletions
diff --git a/drivers/power/test_power.c b/drivers/power/test_power.c
index b99a452a4fda..0152f35dca5c 100644
--- a/drivers/power/test_power.c
+++ b/drivers/power/test_power.c
@@ -30,6 +30,8 @@ static int battery_technology = POWER_SUPPLY_TECHNOLOGY_LION;
static int battery_capacity = 50;
static int battery_voltage = 3300;
+static bool module_initialized;
+
static int test_power_get_ac_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
@@ -185,6 +187,7 @@ static int __init test_power_init(void)
}
}
+ module_initialized = true;
return 0;
failed:
while (--i >= 0)
@@ -209,6 +212,8 @@ static void __exit test_power_exit(void)
for (i = 0; i < ARRAY_SIZE(test_power_supplies); i++)
power_supply_unregister(&test_power_supplies[i]);
+
+ module_initialized = false;
}
module_exit(test_power_exit);
@@ -221,8 +226,8 @@ struct battery_property_map {
};
static struct battery_property_map map_ac_online[] = {
- { 0, "on" },
- { 1, "off" },
+ { 0, "off" },
+ { 1, "on" },
{ -1, NULL },
};
@@ -295,10 +300,16 @@ static const char *map_get_key(struct battery_property_map *map, int value,
return def_key;
}
+static inline void signal_power_supply_changed(struct power_supply *psy)
+{
+ if (module_initialized)
+ power_supply_changed(psy);
+}
+
static int param_set_ac_online(const char *key, const struct kernel_param *kp)
{
ac_online = map_get_value(map_ac_online, key, ac_online);
- power_supply_changed(&test_power_supplies[0]);
+ signal_power_supply_changed(&test_power_supplies[0]);
return 0;
}
@@ -311,7 +322,7 @@ static int param_get_ac_online(char *buffer, const struct kernel_param *kp)
static int param_set_usb_online(const char *key, const struct kernel_param *kp)
{
usb_online = map_get_value(map_ac_online, key, usb_online);
- power_supply_changed(&test_power_supplies[2]);
+ signal_power_supply_changed(&test_power_supplies[2]);
return 0;
}
@@ -325,7 +336,7 @@ static int param_set_battery_status(const char *key,
const struct kernel_param *kp)
{
battery_status = map_get_value(map_status, key, battery_status);
- power_supply_changed(&test_power_supplies[1]);
+ signal_power_supply_changed(&test_power_supplies[1]);
return 0;
}
@@ -339,7 +350,7 @@ static int param_set_battery_health(const char *key,
const struct kernel_param *kp)
{
battery_health = map_get_value(map_health, key, battery_health);
- power_supply_changed(&test_power_supplies[1]);
+ signal_power_supply_changed(&test_power_supplies[1]);
return 0;
}
@@ -353,7 +364,7 @@ static int param_set_battery_present(const char *key,
const struct kernel_param *kp)
{
battery_present = map_get_value(map_present, key, battery_present);
- power_supply_changed(&test_power_supplies[0]);
+ signal_power_supply_changed(&test_power_supplies[0]);
return 0;
}
@@ -369,7 +380,7 @@ static int param_set_battery_technology(const char *key,
{
battery_technology = map_get_value(map_technology, key,
battery_technology);
- power_supply_changed(&test_power_supplies[1]);
+ signal_power_supply_changed(&test_power_supplies[1]);
return 0;
}
@@ -390,7 +401,7 @@ static int param_set_battery_capacity(const char *key,
return -EINVAL;
battery_capacity = tmp;
- power_supply_changed(&test_power_supplies[1]);
+ signal_power_supply_changed(&test_power_supplies[1]);
return 0;
}
@@ -405,7 +416,7 @@ static int param_set_battery_voltage(const char *key,
return -EINVAL;
battery_voltage = tmp;
- power_supply_changed(&test_power_supplies[1]);
+ signal_power_supply_changed(&test_power_supplies[1]);
return 0;
}