linux-kernel - Re: [PATCH] net: bluetooth: Replaced kzalloc and memcpy with kmemdup

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Date:	Mon, 18 Mar 2013 11:56:18 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Alexandru Gheorghiu <gheorghiuandru@...il.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: bluetooth: Replaced kzalloc and memcpy with kmemdup

Hi Alexandru,

* Alexandru Gheorghiu <gheorghiuandru@...il.com> [2013-03-16 16:07:10 +0200]:

> Replaced calls to kzalloc followed by memcpy with a single call to kmemdup.
> Patch found using coccinelle.
> 
> Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@...il.com>
> ---
>  net/bluetooth/a2mp.c |    6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
> index eb0f4b1..140e81c 100644
> --- a/net/bluetooth/a2mp.c
> +++ b/net/bluetooth/a2mp.c
> @@ -397,13 +397,12 @@ static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
>  	if (ctrl) {
>  		u8 *assoc;
>  
> -		assoc = kzalloc(assoc_len, GFP_KERNEL);
> +		assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
>  		if (!assoc) {
>  			amp_ctrl_put(ctrl);
>  			return -ENOMEM;
>  		}
>  
> -		memcpy(assoc, rsp->amp_assoc, assoc_len);
>  		ctrl->assoc = assoc;
>  		ctrl->assoc_len = assoc_len;
>  		ctrl->assoc_rem_len = assoc_len;
> @@ -472,13 +471,12 @@ static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
>  		size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
>  		u8 *assoc;
>  
> -		assoc = kzalloc(assoc_len, GFP_KERNEL);
> +		assoc = kmemdup(rep->amp_assoc, assoc_len, GFP_KERNEL);

Please get into the habit of build your patches before sending them upstream:

  CC [M]  net/bluetooth/a2mp.o
net/bluetooth/a2mp.c: In function ‘a2mp_createphyslink_req’:
net/bluetooth/a2mp.c:474:19: error: ‘rep’ undeclared (first use in this function)
net/bluetooth/a2mp.c:474:19: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [net/bluetooth/a2mp.o] Error 1
make[1]: *** [net/bluetooth] Error 2


	Gustavo
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