linux-kernel - Re: [patch]xprt: remove redundant checks

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Date:	Wed, 16 Mar 2011 10:25:40 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	j223yang@...et.uwaterloo.ca
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch]xprt: remove redundant checks

On Wed, 2011-03-16 at 02:45 -0400, j223yang@...et.uwaterloo.ca wrote:
> 'req' is already dereferenced in 
> 'struct rpc_xprt *xprt = req->rq_xprt;',
> but check again later in the function.
> The patch removes these redundant checks.
> 
> Signed-off-by: Jinqiu Yang <crindy646@...il.com>
> ---
>  xprt.c |    8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/net/sunrpt/xprt.c b/net/sunrpt/xprt.c
> --- a/net/sunrpc/xprt.c	2011-03-16 00:10:08.764164573 -0400
> +++ b/net/sunrpt/xprt.c	2011-03-16 02:33:38.559164414 -0400
> @@ -202,10 +202,8 @@ int xprt_reserve_xprt(struct rpc_task *t
>  		goto out_sleep;
>  	}
>  	xprt->snd_task = task;
> -	if (req) {
> -		req->rq_bytes_sent = 0;
> -		req->rq_ntrans++;
> -	}
> +	req->rq_bytes_sent = 0;
> +	req->rq_ntrans++;
>  	return 1;
>  
>  out_sleep:
> @@ -213,7 +211,7 @@ out_sleep:
>  			task->tk_pid, xprt);
>  	task->tk_timeout = 0;
>  	task->tk_status = -EAGAIN;
> -	if (req && req->rq_ntrans)
> +	if (req->rq_ntrans)
>  		rpc_sleep_on(&xprt->resend, task, NULL);
>  	else
>  		rpc_sleep_on(&xprt->sending, task, NULL);
> --
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You already sent hunk 1 in a different patch, and I've already applied
that to the nfs-for-2.6.39 branch. Could you therefore please resend
this patch with just the second hunk.

Cheers
  Trond

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