rtc: ds3232: add register access error checks

Add missing register access error checks and make it return error code
or print error message.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index 6bf7848c1576d0826ecbe5068e52e696166503d6..321b8670ff7ac50b5bbbca199091e8e018b404f5 100644 (file)
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -262,6 +262,8 @@ static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
                goto out;
 
        ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
+       if (ret)
+               goto out;
 
        if (alarm->enabled) {
                control |= DS3232_REG_CR_A1IE;
@@ -272,7 +274,7 @@ out:
        return ret;
 }
 
-static void ds3232_update_alarm(struct device *dev, unsigned int enabled)
+static int ds3232_update_alarm(struct device *dev, unsigned int enabled)
 {
        struct ds3232 *ds3232 = dev_get_drvdata(dev);
        int control;
@@ -308,10 +310,12 @@ static void ds3232_update_alarm(struct device *dev, unsigned int enabled)
        else
                /* disable alarm1 interrupt */
                control &= ~(DS3232_REG_CR_A1IE);
-       regmap_write(ds3232->regmap, DS3232_REG_CR, control);
+       ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control);
 
 unlock:
        mutex_unlock(&ds3232->mutex);
+
+       return ret;
 }
 
 static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
@@ -321,9 +325,7 @@ static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
        if (ds3232->irq <= 0)
                return -EINVAL;
 
-       ds3232_update_alarm(dev, enabled);
-
-       return 0;
+       return ds3232_update_alarm(dev, enabled);
 }
 
 static irqreturn_t ds3232_irq(int irq, void *dev_id)
@@ -364,11 +366,24 @@ static void ds3232_work(struct work_struct *work)
                } else {
                        /* disable alarm1 interrupt */
                        control &= ~(DS3232_REG_CR_A1IE);
-                       regmap_write(ds3232->regmap, DS3232_REG_CR, control);
+                       ret = regmap_write(ds3232->regmap, DS3232_REG_CR,
+                                          control);
+                       if (ret) {
+                               dev_warn(ds3232->dev,
+                                        "Write Control Register error %d\n",
+                                        ret);
+                               goto unlock;
+                       }
 
                        /* clear the alarm pend flag */
                        stat &= ~DS3232_REG_SR_A1F;
-                       regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
+                       ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
+                       if (ret) {
+                               dev_warn(ds3232->dev,
+                                        "Write Status Register error %d\n",
+                                        ret);
+                               goto unlock;
+                       }
 
                        rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);