[net-next,5/5] staging/rtl8192u: convert skb->tail into skb_tail_pointer(skb)

The change set of 7a884dc "[SK_BUFF]: Convert skb->tail to sk_buff_data_t"
converted skb->tail from pointer into sk_buff_data_t.
Thus skb->tail is not always pointer, the area pointed by skb->tail
should be accessed via skb_tail_pointer().

Found by inspection. Compile tested only.

Cc: Simon Horman <horms@verge.net.au>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
---
 drivers/staging/rtl8192u/r8192U_core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

On Fri, Jun 14, 2013 at 05:58:35PM +0900, Isaku Yamahata wrote:
> The change set of 7a884dc "[SK_BUFF]: Convert skb->tail to sk_buff_data_t"
> converted skb->tail from pointer into sk_buff_data_t.
> Thus skb->tail is not always pointer, the area pointed by skb->tail
> should be accessed via skb_tail_pointer().
> 
> Found by inspection. Compile tested only.
> 
> Cc: Simon Horman <horms@verge.net.au>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: devel@driverdev.osuosl.org
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

Reviewed-by: Simon Horman <horms@verge.net.au>

> ---
>  drivers/staging/rtl8192u/r8192U_core.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
> index 71f5cde..a18430e 100644
> --- a/drivers/staging/rtl8192u/r8192U_core.c
> +++ b/drivers/staging/rtl8192u/r8192U_core.c
> @@ -1271,8 +1271,8 @@ struct sk_buff *DrvAggr_Aggregation(struct net_device *dev, struct ieee80211_drv
>  		/* Subframe drv Tx descriptor and firmware info setting */
>  		skb = pSendList->tx_agg_frames[i];
>  		tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
> -		tx_agg_desc = (tx_desc_819x_usb_aggr_subframe *)agg_skb->tail;
> -		tx_fwinfo = (tx_fwinfo_819x_usb *)(agg_skb->tail + sizeof(tx_desc_819x_usb_aggr_subframe));
> +		tx_agg_desc = (tx_desc_819x_usb_aggr_subframe *)skb_tail_pointer(agg_skb);
> +		tx_fwinfo = (tx_fwinfo_819x_usb *)(skb_tail_pointer(agg_skb) + sizeof(tx_desc_819x_usb_aggr_subframe));
>  
>  		memset(tx_fwinfo,0,sizeof(tx_fwinfo_819x_usb));
>  		/* DWORD 0 */
> -- 
> 1.7.10.4
> 
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On Fri, Jun 14, 2013 at 05:58:35PM +0900, Isaku Yamahata wrote:
> The change set of 7a884dc "[SK_BUFF]: Convert skb->tail to sk_buff_data_t"
> converted skb->tail from pointer into sk_buff_data_t.
> Thus skb->tail is not always pointer, the area pointed by skb->tail
> should be accessed via skb_tail_pointer().
> 
> Found by inspection. Compile tested only.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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From: Simon Horman <horms@verge.net.au>
Date: Mon, 17 Jun 2013 11:03:05 +0900

> On Fri, Jun 14, 2013 at 05:58:35PM +0900, Isaku Yamahata wrote:
>> The change set of 7a884dc "[SK_BUFF]: Convert skb->tail to sk_buff_data_t"
>> converted skb->tail from pointer into sk_buff_data_t.
>> Thus skb->tail is not always pointer, the area pointed by skb->tail
>> should be accessed via skb_tail_pointer().
>> 
>> Found by inspection. Compile tested only.
>> 
>> Cc: Simon Horman <horms@verge.net.au>
>> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> Cc: devel@driverdev.osuosl.org
>> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
> 
> Reviewed-by: Simon Horman <horms@verge.net.au>

Applied.
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