target/linux/xburst/patches-2.6.36/300-battery-fixes.patch

   1 From 2d435d52c63e4dd544938bad638ecd518cc04d1c Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Tue, 26 Oct 2010 20:13:40 +0200
   4 Subject: [PATCH] POWER: jz4740-battery: Protect against concurrent battery readings
   5
   6 We can not handle more then one ADC request at a time to the battery. The patch
   7 adds a mutex around the ADC read code to ensure this.
   8
   9 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
  10
  11 jz4740-battery: Add missing kfree(jz_battery) in jz_battery_remove()
  12
  13 Signed-off-by: Axel Lin <axel.lin@gmail.com>
  14 Acked-By: Lars-Peter Clausen <lars@metafoo.de>
  15 Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
  16 ---
  17  drivers/power/jz4740-battery.c |    8 ++++++++
  18  1 files changed, 8 insertions(+), 0 deletions(-)
  19
  20 --- a/drivers/power/jz4740-battery.c
  21 +++ b/drivers/power/jz4740-battery.c
  22 @@ -47,6 +47,8 @@ struct jz_battery {
  23
  24         struct power_supply battery;
  25         struct delayed_work work;
  26 +
  27 +       struct mutex lock;
  28  };
  29
  30  static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
  31 @@ -68,6 +70,8 @@ static long jz_battery_read_voltage(stru
  32         unsigned long val;
  33         long voltage;
  34
  35 +       mutex_lock(&battery->lock);
  36 +
  37         INIT_COMPLETION(battery->read_completion);
  38
  39         enable_irq(battery->irq);
  40 @@ -91,6 +95,8 @@ static long jz_battery_read_voltage(stru
  41         battery->cell->disable(battery->pdev);
  42         disable_irq(battery->irq);
  43
  44 +       mutex_unlock(&battery->lock);
  45 +
  46         return voltage;
  47  }
  48
  49 @@ -291,6 +297,7 @@ static int __devinit jz_battery_probe(st
  50         jz_battery->pdev = pdev;
  51
  52         init_completion(&jz_battery->read_completion);
  53 +       mutex_init(&jz_battery->lock);
  54
  55         INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
  56
  57 @@ -383,6 +390,7 @@ static int __devexit jz_battery_remove(s
  58
  59         iounmap(jz_battery->base);
  60         release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
  61 +       kfree(jz_battery);
  62
  63         return 0;
  64  }