[v3] trivial patchs for static code analyzer fixes

[PATCH v3 06/10] hw/net/virtio-net:Remove redundant statement in virtio_net_rsc_tcp_ctrl_check()

Posted by Chen Qun 5 years, 5 months ago

Clang static code analyzer show warning:
hw/net/virtio-net.c:2077:5: warning: Value stored to 'tcp_flag' is never read
    tcp_flag &= VIRTIO_NET_TCP_FLAG;
    ^           ~~~~~~~~~~~~~~~~~~~

The 'VIRTIO_NET_TCP_FLAG' is '0x3F'. The last ‘tcp_flag’ assignment statement is
 the same as that of the first two statements.

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
---
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a1fe9e9285..cb0d27084c 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2075,7 +2075,6 @@ static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain,
     tcp_flag = htons(tcp->th_offset_flags);
     tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10;
     tcp_flag &= VIRTIO_NET_TCP_FLAG;
-    tcp_flag = htons(tcp->th_offset_flags) & 0x3F;
     if (tcp_flag & TH_SYN) {
         chain->stat.tcp_syn++;
         return RSC_BYPASS;
-- 
2.23.0

Re: [PATCH v3 06/10] hw/net/virtio-net:Remove redundant statement in virtio_net_rsc_tcp_ctrl_check()

Posted by Laurent Vivier 5 years, 5 months ago

Le 27/08/2020 à 13:03, Chen Qun a écrit :
> Clang static code analyzer show warning:
> hw/net/virtio-net.c:2077:5: warning: Value stored to 'tcp_flag' is never read
>     tcp_flag &= VIRTIO_NET_TCP_FLAG;
>     ^           ~~~~~~~~~~~~~~~~~~~
> 
> The 'VIRTIO_NET_TCP_FLAG' is '0x3F'. The last ‘tcp_flag’ assignment statement is
>  the same as that of the first two statements.
> 
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Reviewed-by: Li Qiang <liq3ea@gmail.com>
> ---
> Cc: "Michael S. Tsirkin" <mst@redhat.com>
> Cc: Jason Wang <jasowang@redhat.com>
> ---
>  hw/net/virtio-net.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index a1fe9e9285..cb0d27084c 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -2075,7 +2075,6 @@ static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain,
>      tcp_flag = htons(tcp->th_offset_flags);
>      tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10;
>      tcp_flag &= VIRTIO_NET_TCP_FLAG;
> -    tcp_flag = htons(tcp->th_offset_flags) & 0x3F;
>      if (tcp_flag & TH_SYN) {
>          chain->stat.tcp_syn++;
>          return RSC_BYPASS;
> 

Applied to my trivial-patches branch.

Thanks,
Laurent