linux-kernel - [patch] virtio: silence uninitialized variable warnings

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Message-ID: <20160401110248.GA6048@mwanda>
Date:	Fri, 1 Apr 2016 14:02:48 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] virtio: silence uninitialized variable warnings

Most ->get() functions seem to call BUG_ON() if offset + len is out of
range, but rproc_virtio_get() returns early without initializing ret.
Presumably it can't actually happen but it leads to a static checker
warning.  Let's just initialize "ret".

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 6e6cb0c9..597dbef 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -334,7 +334,7 @@ static inline void virtio_cread_bytes(struct virtio_device *vdev,
 
 static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
 {
-	u8 ret;
+	u8 ret = 0;
 	vdev->config->get(vdev, offset, &ret, sizeof(ret));
 	return ret;
 }
@@ -348,7 +348,7 @@ static inline void virtio_cwrite8(struct virtio_device *vdev,
 static inline u16 virtio_cread16(struct virtio_device *vdev,
 				 unsigned int offset)
 {
-	u16 ret;
+	u16 ret = 0;
 	vdev->config->get(vdev, offset, &ret, sizeof(ret));
 	return virtio16_to_cpu(vdev, (__force __virtio16)ret);
 }
@@ -363,7 +363,7 @@ static inline void virtio_cwrite16(struct virtio_device *vdev,
 static inline u32 virtio_cread32(struct virtio_device *vdev,
 				 unsigned int offset)
 {
-	u32 ret;
+	u32 ret = 0;
 	vdev->config->get(vdev, offset, &ret, sizeof(ret));
 	return virtio32_to_cpu(vdev, (__force __virtio32)ret);
 }
@@ -378,7 +378,7 @@ static inline void virtio_cwrite32(struct virtio_device *vdev,
 static inline u64 virtio_cread64(struct virtio_device *vdev,
 				 unsigned int offset)
 {
-	u64 ret;
+	u64 ret = 0;
 	__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
 	return virtio64_to_cpu(vdev, (__force __virtio64)ret);
 }