linux-kernel - [PATCH] rtc: isl1208: Fix return value of nvmem callbacks

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Date: Wed, 12 Jun 2024 08:08:31 +0000
From: Joy Chakraborty <joychakr@...gle.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, Trent Piepho <tpiepho@...inj.com>, 
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, Dan Carpenter <dan.carpenter@...aro.org>
Cc: linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Joy Chakraborty <joychakr@...gle.com>, stable@...r.kernel.org
Subject: [PATCH] rtc: isl1208: Fix return value of nvmem callbacks

Read/write callbacks registered with nvmem core expect 0 to be returned
on success and a negative value to be returned on failure.

isl1208_nvmem_read()/isl1208_nvmem_write() currently return the number of
bytes read/written on success, fix to return 0 on success and negative on
failure.

Fixes: c3544f6f51ed ("rtc: isl1208: Add new style nvmem support to driver")
Cc: stable@...r.kernel.org
Signed-off-by: Joy Chakraborty <joychakr@...gle.com>
---
 drivers/rtc/rtc-isl1208.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index e50c23ee1646..206f96b90f58 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -775,14 +775,13 @@ static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf,
 {
 	struct isl1208_state *isl1208 = priv;
 	struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);
-	int ret;
 
 	/* nvmem sanitizes offset/count for us, but count==0 is possible */
 	if (!count)
 		return count;
-	ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf,
+
+	return isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf,
 				    count);
-	return ret == 0 ? count : ret;
 }
 
 static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf,
@@ -790,15 +789,13 @@ static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf,
 {
 	struct isl1208_state *isl1208 = priv;
 	struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);
-	int ret;
 
 	/* nvmem sanitizes off/count for us, but count==0 is possible */
 	if (!count)
 		return count;
-	ret = isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf,
-				   count);
 
-	return ret == 0 ? count : ret;
+	return isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf,
+				   count);
 }
 
 static const struct nvmem_config isl1208_nvmem_config = {
-- 
2.45.2.505.gda0bf45e8d-goog