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Groups > linux.kernel > #1318589

[PATCH v4 02/10] rtc: max77686: Use ARRAY_SIZE() instead of current array length

From Javier Martinez Canillas <javier@osg.samsung.com>
Newsgroups linux.kernel
Subject [PATCH v4 02/10] rtc: max77686: Use ARRAY_SIZE() instead of current array length
Date 2016-01-27 04:40 +0100
Message-ID <qVp7A-5OH-17@gated-at.bofh.it> (permalink)
References <qVp7A-5OH-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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It is better to use the ARRAY_SIZE() macro instead of the array length
to avoid bugs if the array is later changed and the length not updated.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Andi Shyti <andi.shyti@samsung.com>

---

Changes in v4:
- Add Andi Shyti's Reviewed-by to patch #2.

Changes in v3:
- Add Krzysztof Kozlowski's Tested-by tag to patch #2.
- Add Laxman Dewangan's Acked-by tag to patch #2.
- Use ARRAY_SIZE() in all places. Suggested by Laxman Dewangan.

Changes in v2:
- Add Krzysztof Kozlowski's Reviewed-by tag to patch #2.

 drivers/rtc/rtc-max77686.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 6653c3d11b66..d84a50c9f7f7 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -149,7 +149,7 @@ static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm)
 		goto out;
 
 	ret = regmap_bulk_read(info->max77686->rtc_regmap,
-				MAX77686_RTC_SEC, data, RTC_NR_TIME);
+				MAX77686_RTC_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,	ret);
 		goto out;
@@ -177,7 +177,7 @@ static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	mutex_lock(&info->lock);
 
 	ret = regmap_bulk_write(info->max77686->rtc_regmap,
-				 MAX77686_RTC_SEC, data, RTC_NR_TIME);
+				 MAX77686_RTC_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
 				ret);
@@ -205,7 +205,7 @@ static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 		goto out;
 
 	ret = regmap_bulk_read(info->max77686->rtc_regmap,
-				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
+				 MAX77686_ALARM1_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
 				__func__, __LINE__, ret);
@@ -215,7 +215,7 @@ static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	max77686_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 
 	alrm->enabled = 0;
-	for (i = 0; i < RTC_NR_TIME; i++) {
+	for (i = 0; i < ARRAY_SIZE(data); i++) {
 		if (data[i] & ALARM_ENABLE_MASK) {
 			alrm->enabled = 1;
 			break;
@@ -252,7 +252,7 @@ static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
 		goto out;
 
 	ret = regmap_bulk_read(info->max77686->rtc_regmap,
-				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
+				 MAX77686_ALARM1_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
 				__func__, ret);
@@ -261,11 +261,11 @@ static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
 
 	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
 
-	for (i = 0; i < RTC_NR_TIME; i++)
+	for (i = 0; i < ARRAY_SIZE(data); i++)
 		data[i] &= ~ALARM_ENABLE_MASK;
 
 	ret = regmap_bulk_write(info->max77686->rtc_regmap,
-				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
+				 MAX77686_ALARM1_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
 				__func__, ret);
@@ -291,7 +291,7 @@ static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
 		goto out;
 
 	ret = regmap_bulk_read(info->max77686->rtc_regmap,
-				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
+				 MAX77686_ALARM1_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
 				__func__, ret);
@@ -312,7 +312,7 @@ static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
 		data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
 
 	ret = regmap_bulk_write(info->max77686->rtc_regmap,
-				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
+				 MAX77686_ALARM1_SEC, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
 				__func__, ret);
@@ -341,7 +341,7 @@ static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 		goto out;
 
 	ret = regmap_bulk_write(info->max77686->rtc_regmap,
-				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
+				 MAX77686_ALARM1_SEC, data, ARRAY_SIZE(data));
 
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
@@ -406,7 +406,8 @@ static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
 
 	info->rtc_24hr_mode = 1;
 
-	ret = regmap_bulk_write(info->max77686->rtc_regmap, MAX77686_RTC_CONTROLM, data, 2);
+	ret = regmap_bulk_write(info->max77686->rtc_regmap,
+				MAX77686_RTC_CONTROLM, data, ARRAY_SIZE(data));
 	if (ret < 0) {
 		dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 				__func__, ret);
-- 
2.5.0

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[PATCH v4 02/10] rtc: max77686: Use ARRAY_SIZE() instead of current array length Javier Martinez Canillas <javier@osg.samsung.com> - 2016-01-27 04:40 +0100
  Re: [PATCH v4 02/10] rtc: max77686: Use ARRAY_SIZE() instead of current  array length Laxman Dewangan <ldewangan@nvidia.com> - 2016-01-27 07:10 +0100

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