[PATCH] mtd: mchp23k256: propagate return value of spi_sync()

[Antonio Borneo]

The call to spi_sync() can fail.
Check the return value and propagate it.

Signed-off-by: Antonio Borneo <borneo.anto...@gmail.com>
---
To: David Woodhouse <dw...@infradead.org>
To: Brian Norris <computersforpe...@gmail.com>
To: Boris Brezillon <boris.brezil...@free-electrons.com>
To: Marek Vasut <marek.va...@gmail.com>
To: Richard Weinberger <rich...@nod.at>
To: Cyrille Pitchen <cyrille.pitc...@atmel.com>
To: Andrew Lunn <and...@lunn.ch>
To: Chris Packham <chris.pack...@alliedtelesis.co.nz>
To: Rob Herring <r...@kernel.org>
To: linux-...@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/mtd/devices/mchp23k256.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/devices/mchp23k256.c b/drivers/mtd/devices/mchp23k256.c
index 787e9ec7..4c91c0e 100644
--- a/drivers/mtd/devices/mchp23k256.c
+++ b/drivers/mtd/devices/mchp23k256.c
@@ -68,6 +68,7 @@ static int mchp23k256_write(struct mtd_info *mtd, loff_t to, 
size_t len,
        struct spi_transfer transfer[2] = {};
        struct spi_message message;
        unsigned char command[MAX_CMD_SIZE];
+       int ret;
 
        spi_message_init(&message);
 
@@ -84,12 +85,16 @@ static int mchp23k256_write(struct mtd_info *mtd, loff_t 
to, size_t len,
 
        mutex_lock(&flash->lock);
 
-       spi_sync(flash->spi, &message);
+       ret = spi_sync(flash->spi, &message);
+
+       mutex_unlock(&flash->lock);
+
+       if (ret)
+               return ret;
 
        if (retlen && message.actual_length > sizeof(command))
                *retlen += message.actual_length - sizeof(command);
 
-       mutex_unlock(&flash->lock);
        return 0;
 }
 
@@ -100,6 +105,7 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t 
from, size_t len,
        struct spi_transfer transfer[2] = {};
        struct spi_message message;
        unsigned char command[MAX_CMD_SIZE];
+       int ret;
 
        spi_message_init(&message);
 
@@ -117,12 +123,16 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t 
from, size_t len,
 
        mutex_lock(&flash->lock);
 
-       spi_sync(flash->spi, &message);
+       ret = spi_sync(flash->spi, &message);
+
+       mutex_unlock(&flash->lock);
+
+       if (ret)
+               return ret;
 
        if (retlen && message.actual_length > sizeof(command))
                *retlen += message.actual_length - sizeof(command);
 
-       mutex_unlock(&flash->lock);
        return 0;
 }
 
-- 
2.7.4