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From 2d435d52c63e4dd544938bad638ecd518cc04d1c Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Tue, 26 Oct 2010 20:13:40 +0200
Subject: [PATCH] POWER: jz4740-battery: Protect against concurrent battery readings
We can not handle more then one ADC request at a time to the battery. The patch
adds a mutex around the ADC read code to ensure this.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
jz4740-battery: Add missing kfree(jz_battery) in jz_battery_remove()
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-By: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
drivers/power/jz4740-battery.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
--- a/drivers/power/jz4740-battery.c
+++ b/drivers/power/jz4740-battery.c
@@ -47,6 +47,8 @@ struct jz_battery {
struct power_supply battery;
struct delayed_work work;
+
+ struct mutex lock;
};
static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
@@ -68,6 +70,8 @@ static long jz_battery_read_voltage(stru
unsigned long val;
long voltage;
+ mutex_lock(&battery->lock);
+
INIT_COMPLETION(battery->read_completion);
enable_irq(battery->irq);
@@ -91,6 +95,8 @@ static long jz_battery_read_voltage(stru
battery->cell->disable(battery->pdev);
disable_irq(battery->irq);
+ mutex_unlock(&battery->lock);
+
return voltage;
}
@@ -291,6 +297,7 @@ static int __devinit jz_battery_probe(st
jz_battery->pdev = pdev;
init_completion(&jz_battery->read_completion);
+ mutex_init(&jz_battery->lock);
INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
@@ -383,6 +390,7 @@ static int __devexit jz_battery_remove(s
iounmap(jz_battery->base);
release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
+ kfree(jz_battery);
return 0;
}
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