linux-kernel - Re: [PATCH] staging: rtl8192e: Make use kmemdup

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Date:   Sat, 03 Aug 2019 10:52:04 -0700
From:   Joe Perches <joe@...ches.com>
To:     Hariprasad Kelam <hariprasad.kelam@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Himadri Pandya <himadri18.07@...il.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Michiel Schuurmans <michielschuurmans@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192e: Make use kmemdup

On Sat, 2019-08-03 at 23:10 +0530, Hariprasad Kelam wrote:
> As kmemdup API does kmalloc + memcpy . We can make use of it instead of
> calling kmalloc and memcpy independetly.
[]
> diff --git a/drivers/staging/rtl8192e/rtllib_softmac.c b/drivers/staging/rtl8192e/rtllib_softmac.c
[]
> @@ -1382,10 +1382,8 @@ rtllib_association_req(struct rtllib_network *beacon,
>  	ieee->assocreq_ies = NULL;
>  	ies = &(hdr->info_element[0].id);
>  	ieee->assocreq_ies_len = (skb->data + skb->len) - ies;
> -	ieee->assocreq_ies = kmalloc(ieee->assocreq_ies_len, GFP_ATOMIC);
> -	if (ieee->assocreq_ies)
> -		memcpy(ieee->assocreq_ies, ies, ieee->assocreq_ies_len);
> -	else {
> +	ieee->assocreq_ies = kmemdup(ies, ieee->assocreq_ies_len, GFP_ATOMIC);
> +	if (!ieee->assocreq_ies) {
>  		netdev_info(ieee->dev,
>  			    "%s()Warning: can't alloc memory for assocreq_ies\n",
>  			    __func__);
> @@ -2259,12 +2257,10 @@ rtllib_rx_assoc_resp(struct rtllib_device *ieee, struct sk_buff *skb,
>  			ieee->assocresp_ies = NULL;
>  			ies = &(assoc_resp->info_element[0].id);
>  			ieee->assocresp_ies_len = (skb->data + skb->len) - ies;
> -			ieee->assocresp_ies = kmalloc(ieee->assocresp_ies_len,
> +			ieee->assocresp_ies = kmemdup(ies,
> +						      ieee->assocresp_ies_len,
>  						      GFP_ATOMIC);
> -			if (ieee->assocresp_ies)
> -				memcpy(ieee->assocresp_ies, ies,
> -				       ieee->assocresp_ies_len);
> -			else {
> +			if (!ieee->assocresp_ies) {
>  				netdev_info(ieee->dev,
>  					    "%s()Warning: can't alloc memory for assocresp_ies\n",
>  					    __func__);

Could also remove the netdev_info() uses for allocation failures.
These are redundant as a dump_stack() is already done when OOM.