From: Arnd Bergmann <arnd@arndb.de>
Date: Sat, 4 Aug 2012 11:18:20 +0000 (+0000)
Subject: spi/s3c64xx: improve error handling
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4732cc636075ff1a0219bf933d8c23d1a99f41ed;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

spi/s3c64xx: improve error handling

When a device tree definition os an s3c64xx SPI master is missing
a "controller-data" subnode, the newly added s3c64xx_get_slave_ctrldata
function might use uninitialized memory in place of that node,
which was correctly reported by gcc.

Without this patch, building s3c6400_defconfig results in:

drivers/spi/spi-s3c64xx.c: In function 's3c64xx_get_slave_ctrldata.isra.25':
drivers/spi/spi-s3c64xx.c:841:5: warning: 'data_np' may be used uninitialized in this function [-Wuninitialized]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Jaswinder Singh <jaswinder.singh@linaro.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
---

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 646a7657fe6..cfa2c35dfee 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -826,7 +826,7 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 				struct spi_device *spi)
 {
 	struct s3c64xx_spi_csinfo *cs;
-	struct device_node *slave_np, *data_np;
+	struct device_node *slave_np, *data_np = NULL;
 	u32 fb_delay = 0;
 
 	slave_np = spi->dev.of_node;