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Subject[PATCH 2/2] virtio_ring: fix error - 'prev' and 'head_flags' may be used uninitialized in this function
Date
when run "make virtio" in linux/tools,
the error: "'prev' and 'head_flags' may be used
uninitialized in this function" occurs

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
drivers/virtio/virtio_ring.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 89bfe46a8a7f..290bdf8a3d36 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -486,7 +486,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
struct vring_virtqueue *vq = to_vvq(_vq);
struct scatterlist *sg;
struct vring_desc *desc;
- unsigned int i, n, avail, descs_used, prev, err_idx;
+ unsigned int i, n, avail, descs_used, prev = 0, err_idx;
int head;
bool indirect;

@@ -1173,8 +1173,8 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
struct vring_packed_desc *desc;
struct scatterlist *sg;
unsigned int i, n, c, descs_used, err_idx;
- __le16 head_flags, flags;
- u16 head, id, prev, curr, avail_used_flags;
+ __le16 head_flags = 0, flags;
+ u16 head, id, prev = 0, curr, avail_used_flags;

START_USE(vq);

--
2.25.1
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