[PATCH] nvme-tcp: memset scatterlist before sg_init_marker it

[Sagi Grimberg]

On 12/20/21 4:54 AM, Jackie Liu wrote:
> From: Jackie Liu <liuyun01 at kylinos.cn>
> 
> sg_init_marker's sg need initialized, otherwise report:
> 
> [...]
> In file included from ../include/linux/dma-mapping.h:10,
>                   from ../include/linux/skbuff.h:31,
>                   from ../include/net/net_namespace.h:39,
>                   from ../include/linux/netdevice.h:37,
>                   from ../include/net/sock.h:46,
>                   from ../drivers/nvme/host/tcp.c:12:
> ../drivers/nvme/host/tcp.c: In function ‘nvme_tcp_ddgst_update’:
> ../include/linux/scatterlist.h:214:16: error: ‘sg.page_link’ is used uninitialized in this function [-Werror=uninitialized]
>    214 |  sg->page_link |= SG_END;
>        |                ^~
> cc1: all warnings being treated as errors
> make[4]: *** [../scripts/Makefile.build:287: drivers/nvme/host/tcp.o] Error 1
> make[3]: *** [../scripts/Makefile.build:549: drivers/nvme/host] Error 2
> make[2]: *** [../scripts/Makefile.build:549: drivers/nvme] Error 2
> make[2]: *** Waiting for unfinished jobs....
> [...]

This needs:
Fixes: 3f2304f8c6d6 ("nvme-tcp: add NVMe over TCP host driver")

> 
> Reported-by: k2ci <kernel-bot at kylinos.cn>
> Signed-off-by: Jackie Liu <liuyun01 at kylinos.cn>
> ---
>   drivers/nvme/host/tcp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
> index 4ceb28675fdf..8fd8cbe23683 100644
> --- a/drivers/nvme/host/tcp.c
> +++ b/drivers/nvme/host/tcp.c
> @@ -348,7 +348,7 @@ static inline void nvme_tcp_ddgst_update(struct ahash_request *hash,
>   {
>   	struct scatterlist sg;
>   
> -	sg_init_marker(&sg, 1);
> +	sg_init_table(&sg, 1);
>   	sg_set_page(&sg, page, len, off);
>   	ahash_request_set_crypt(hash, &sg, NULL, len);
>   	crypto_ahash_update(hash);
> 

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>