linux-kernel - Re: [-mm Patch] net/bluetooth/hidp/core.c: Make hidp_setup

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Date:	Mon, 24 Sep 2007 00:13:22 +0200
From:	roel <12o3l@...cali.nl>
To:	WANG Cong <xiyou.wangcong@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, marcel@...tmann.org,
	bluez-devel@...ts.sf.net, maxk@...lcomm.com
Subject: Re: [-mm Patch] net/bluetooth/hidp/core.c: Make hidp_setup_input()
 return int

WANG Cong wrote:
> This patch does the following things:
> 
> - Make hidp_setup_input() return int to indicate errors.
> - Check its return value to handle errors.
> 
> Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
> 
> ---
>  net/bluetooth/hidp/core.c |    7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6.23-rc6-mm1/net/bluetooth/hidp/core.c
> ===================================================================
> --- linux-2.6.23-rc6-mm1.orig/net/bluetooth/hidp/core.c
> +++ linux-2.6.23-rc6-mm1/net/bluetooth/hidp/core.c
> @@ -625,7 +625,7 @@ static struct device *hidp_get_device(st
>  	return conn ? &conn->dev : NULL;
>  }
>  
> -static inline void hidp_setup_input(struct hidp_session *session, struct hidp_connadd_req *req)
> +static inline int hidp_setup_input(struct hidp_session *session, struct hidp_connadd_req *req)
>  {
>  	struct input_dev *input = session->input;
>  	int i;
> @@ -669,7 +669,7 @@ static inline void hidp_setup_input(stru
>  
>  	input->event = hidp_input_event;
>  
> -	input_register_device(input);
> +	return input_register_device(input);
>  }
>  
>  static int hidp_open(struct hid_device *hid)
> @@ -823,7 +823,8 @@ int hidp_add_connection(struct hidp_conn
>  	session->idle_to = req->idle_to;
>  
>  	if (session->input)
> -		hidp_setup_input(session, req);
> +		if ((err = (hidp_setup_input(session, req))))
> +			goto failed;

This is confusing, why not just do

	if (session->input) {
		err = hidp_setup_input(session, req);
		if (err)
			goto failed;
	}

>  
>  	if (session->hid)
>  		hidp_setup_hid(session, req);
> -
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