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drivers/power/ds2780_battery.c: fix deadlock upon insertion and removal 

Fixes the deadlock when inserting and removing the ds2780.

Signed-off-by: Clifton Barnes <cabarnes@indesign-llc.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: <stable@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Clifton Barnes 2011-11-02 13:39:55 -07:00 committed by Linus Torvalds
parent 9fe678fa2f
commit 0e053fcbbb
1 changed files with 9 additions and 0 deletions
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9
drivers/power/ds2780_battery.c
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@ -39,6 +39,7 @@ struct ds2780_device_info {
struct device *dev;
struct power_supply bat;
struct device *w1_dev;
struct task_struct *mutex_holder;
};
enum current_types {
@ -63,6 +64,9 @@ static inline struct power_supply *to_power_supply(struct device *dev)
static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
char *buf, int addr, size_t count, int io)
{
if (dev_info->mutex_holder == current)
return w1_ds2780_io_nolock(dev_info->w1_dev, buf, addr, count, io);
else
return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
}
@ -775,6 +779,7 @@ static int __devinit ds2780_battery_probe(struct platform_device *pdev)
dev_info->bat.properties = ds2780_battery_props;
dev_info->bat.num_properties = ARRAY_SIZE(ds2780_battery_props);
dev_info->bat.get_property = ds2780_battery_get_property;
dev_info->mutex_holder = current;
ret = power_supply_register(&pdev->dev, &dev_info->bat);
if (ret) {
@ -804,6 +809,8 @@ static int __devinit ds2780_battery_probe(struct platform_device *pdev)
goto fail_remove_bin_file;
}
dev_info->mutex_holder = NULL;
return 0;
fail_remove_bin_file:
@ -823,6 +830,8 @@ static int __devexit ds2780_battery_remove(struct platform_device *pdev)
{
struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
dev_info->mutex_holder = current;
/* remove attributes */
sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);