linux-kernel - Re: [PATCH] SUNRPC: Allow one callback request to be received from two sk

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Date:	Mon, 20 Jan 2014 18:27:19 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	shaobingqing <shaobingqing@...tor.com.cn>,
	trond.myklebust@...marydata.com, bfields@...hat.com,
	davem@...emloft.net
CC:	linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SUNRPC: Allow one callback request to be received from
 two sk_buff

Hello.

On 20-01-2014 10:59, shaobingqing wrote:

> In current code, there only one struct rpc_rqst is prealloced. If one
> callback request is received from two sk_buff, the xprt_alloc_bc_request
> would be execute two times with the same transport->xid. The first time
> xprt_alloc_bc_request will alloc one struct rpc_rqst and the TCP_RCV_COPY_DATA
> bit of transport->tcp_flags will not be cleared. The second time
> xprt_alloc_bc_request could not alloc struct rpc_rqst any more and NULL
> pointer will be returned, then xprt_force_disconnect occur. I think one
> callback request can be allowed to be received from two sk_buff.

> Signed-off-by: shaobingqing <shaobingqing@...tor.com.cn>
> ---
>   net/sunrpc/xprtsock.c |   11 +++++++++--
>   1 files changed, 9 insertions(+), 2 deletions(-)

> diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
> index ee03d35..606950d 100644
> --- a/net/sunrpc/xprtsock.c
> +++ b/net/sunrpc/xprtsock.c
[...]
> @@ -1297,7 +1303,8 @@ static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
>   		list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
>   		spin_unlock(&bc_serv->sv_cb_lock);
>   		wake_up(&bc_serv->sv_cb_waitq);
> -	}
> +	} else
> +		req_partial = req;

    {} is needed in the *else* branch since it's already used in another 
branch of *if* -- see Documentation/CodingStyle.

WBR, Sergei

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