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Subject[PATCH 8/9] power: supply: smb347-charger: Replace mutex with IRQ disable/enable
Date
From: Dmitry Osipenko <digetx@gmail.com>

Rather properly disable/enable IRQ than use mutex.
This patch makes code easier to follow.

Tested-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
---
drivers/power/supply/smb347-charger.c | 38 ++++++++++++++-------------
1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/power/supply/smb347-charger.c b/drivers/power/supply/smb347-charger.c
index ce2ebfe601d6..60a0ca2d6d74 100644
--- a/drivers/power/supply/smb347-charger.c
+++ b/drivers/power/supply/smb347-charger.c
@@ -16,7 +16,6 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
-#include <linux/mutex.h>
#include <linux/power_supply.h>
#include <linux/power/smb347-charger.h>
#include <linux/regmap.h>
@@ -122,7 +121,6 @@

/**
* struct smb347_charger - smb347 charger instance
- * @lock: protects concurrent access to online variables
* @dev: pointer to device
* @regmap: pointer to driver regmap
* @mains: power_supply instance for AC/DC power
@@ -134,7 +132,6 @@
* @pdata: pointer to platform data
*/
struct smb347_charger {
- struct mutex lock;
struct device *dev;
struct regmap *regmap;
struct power_supply *mains;
@@ -243,11 +240,9 @@ static int smb347_update_ps_status(struct smb347_charger *smb)
if (smb->pdata->use_usb)
usb = !(val & IRQSTAT_E_USBIN_UV_STAT);

- mutex_lock(&smb->lock);
ret = smb->mains_online != dc || smb->usb_online != usb;
smb->mains_online = dc;
smb->usb_online = usb;
- mutex_unlock(&smb->lock);

return ret;
}
@@ -263,13 +258,7 @@ static int smb347_update_ps_status(struct smb347_charger *smb)
*/
static bool smb347_is_ps_online(struct smb347_charger *smb)
{
- bool ret;
-
- mutex_lock(&smb->lock);
- ret = smb->usb_online || smb->mains_online;
- mutex_unlock(&smb->lock);
-
- return ret;
+ return smb->usb_online || smb->mains_online;
}

/**
@@ -303,14 +292,13 @@ static int smb347_charging_set(struct smb347_charger *smb, bool enable)
return 0;
}

- mutex_lock(&smb->lock);
if (smb->charging_enabled != enable) {
ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
enable ? CMD_A_CHG_ENABLED : 0);
if (!ret)
smb->charging_enabled = enable;
}
- mutex_unlock(&smb->lock);
+
return ret;
}

@@ -995,9 +983,9 @@ static int smb347_get_charging_status(struct smb347_charger *smb,
return status;
}

-static int smb347_get_property(struct power_supply *psy,
- enum power_supply_property prop,
- union power_supply_propval *val)
+static int smb347_get_property_locked(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
{
struct smb347_charger *smb = power_supply_get_drvdata(psy);
int ret;
@@ -1064,6 +1052,21 @@ static int smb347_get_property(struct power_supply *psy,
return 0;
}

+static int smb347_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb = power_supply_get_drvdata(psy);
+ struct i2c_client *client = to_i2c_client(smb->dev);
+ int ret;
+
+ disable_irq(client->irq);
+ ret = smb347_get_property_locked(psy, prop, val);
+ enable_irq(client->irq);
+
+ return ret;
+}
+
static enum power_supply_property smb347_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
@@ -1241,7 +1244,6 @@ static int smb347_probe(struct i2c_client *client,

i2c_set_clientdata(client, smb);

- mutex_init(&smb->lock);
smb->dev = &client->dev;
smb->id = id->driver_data;

--
2.25.0
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