linux-kernel - [PATCH 5.4 084/453] rtc: pcf2127: fix pcf2127_nvmem

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Message-Id: <20201228124941.272600891@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:45:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 084/453] rtc: pcf2127: fix pcf2127_nvmem_read/write() returns

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit ba1c30bf3f2536f248d262c6f257b5a787305991 ]

These functions should return zero on success.  Non-zero returns are
treated as error.  On some paths, this doesn't matter but in
nvmem_cell_read() a non-zero return would be passed to ERR_PTR() and
lead to an Oops.

Fixes: d6c3029f32f7 ("rtc: pcf2127: add support for accessing internal static RAM")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Link: https://lore.kernel.org/r/20201022070451.GA2817669@mwanda
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/rtc/rtc-pcf2127.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 02b069caffd57..d1d37a204264c 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -230,10 +230,8 @@ static int pcf2127_nvmem_read(void *priv, unsigned int offset,
 	if (ret)
 		return ret;
 
-	ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_RAM_RD_CMD,
-			       val, bytes);
-
-	return ret ?: bytes;
+	return regmap_bulk_read(pcf2127->regmap, PCF2127_REG_RAM_RD_CMD,
+				val, bytes);
 }
 
 static int pcf2127_nvmem_write(void *priv, unsigned int offset,
@@ -248,10 +246,8 @@ static int pcf2127_nvmem_write(void *priv, unsigned int offset,
 	if (ret)
 		return ret;
 
-	ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_WRT_CMD,
-				val, bytes);
-
-	return ret ?: bytes;
+	return regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_WRT_CMD,
+				 val, bytes);
 }
 
 /* watchdog driver */
-- 
2.27.0