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Subject[PATCH 08/12] power supply : Use mutex instead of semaphore in driver core
Signed-off-by: Dave Young <hidave.darkstar@gmail.com> 

---
drivers/power/apm_power.c | 6 +++---
drivers/power/power_supply_core.c | 8 ++++----
2 files changed, 7 insertions(+), 7 deletions(-)

diff -upr linux/drivers/power/apm_power.c linux.new/drivers/power/apm_power.c
--- linux/drivers/power/apm_power.c 2007-12-28 10:36:26.000000000 +0800
+++ linux.new/drivers/power/apm_power.c 2007-12-28 10:38:03.000000000 +0800
@@ -207,10 +207,10 @@ static void apm_battery_apm_get_power_st
union power_supply_propval status;
union power_supply_propval capacity, time_to_full, time_to_empty;

- down(&power_supply_class->sem);
+ mutex_lock(&power_supply_class->mutex);
find_main_battery();
if (!main_battery) {
- up(&power_supply_class->sem);
+ mutex_unlock(&power_supply_class->mutex);
return;
}

@@ -278,7 +278,7 @@ static void apm_battery_apm_get_power_st
}
}

- up(&power_supply_class->sem);
+ mutex_unlock(&power_supply_class->mutex);
}

static int __init apm_battery_init(void)
diff -upr linux/drivers/power/power_supply_core.c linux.new/drivers/power/power_supply_core.c
--- linux/drivers/power/power_supply_core.c 2007-12-28 10:36:49.000000000 +0800
+++ linux.new/drivers/power/power_supply_core.c 2007-12-28 10:38:55.000000000 +0800
@@ -31,7 +31,7 @@ static void power_supply_changed_work(st
for (i = 0; i < psy->num_supplicants; i++) {
struct device *dev;

- down(&power_supply_class->sem);
+ mutex_lock(&power_supply_class->mutex);
list_for_each_entry(dev, &power_supply_class->devices, node) {
struct power_supply *pst = dev_get_drvdata(dev);

@@ -40,7 +40,7 @@ static void power_supply_changed_work(st
pst->external_power_changed(pst);
}
}
- up(&power_supply_class->sem);
+ mutex_unlock(&power_supply_class->mutex);
}

power_supply_update_leds(psy);
@@ -60,7 +60,7 @@ int power_supply_am_i_supplied(struct po
union power_supply_propval ret = {0,};
struct device *dev;

- down(&power_supply_class->sem);
+ mutex_lock(&power_supply_class->mutex);
list_for_each_entry(dev, &power_supply_class->devices, node) {
struct power_supply *epsy = dev_get_drvdata(dev);
int i;
@@ -76,7 +76,7 @@ int power_supply_am_i_supplied(struct po
}
}
out:
- up(&power_supply_class->sem);
+ mutex_unlock(&power_supply_class->mutex);

dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);


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