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Subject[PATCH v2 3/3] w1: ds2780, fix deadlock upon insertion and removal
Fixes the deadlock when inserting and removing the ds2780.

Signed-off-by: Clifton Barnes <cabarnes@indesign-llc.com>
---
drivers/power/ds2780_battery.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/power/ds2780_battery.c b/drivers/power/ds2780_battery.c
index 2571b41..91a783d 100644
--- a/drivers/power/ds2780_battery.c
+++ b/drivers/power/ds2780_battery.c
@@ -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);

--
1.7.6


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