Re: [PATCH] staging: rtl8723au: use list_first_entry*

[Jes Sorensen <Jes.Sorensen@redhat.com>]

Geliang Tang <geliangtang@163.com> writes:
> Use list_first_entry*() instead of container_of() to simplify the code.
>
> Signed-off-by: Geliang Tang <geliangtang@163.com>
> ---
>  drivers/staging/rtl8723au/core/rtw_recv.c | 49 +++++++++----------------------
>  drivers/staging/rtl8723au/core/rtw_xmit.c | 26 +++++-----------
>  2 files changed, 22 insertions(+), 53 deletions(-)

This looks fine to me. When these changes gets large, it may be better
to break them down into multiple patches as it's easier to debug if
there is a bug somewhere.


Acked-by: Jes Sorensen <Jes.Sorensen@redhat.com>

>
> diff --git a/drivers/staging/rtl8723au/core/rtw_recv.c b/drivers/staging/rtl8723au/core/rtw_recv.c
> index 0a7741c..b095d09 100644
> --- a/drivers/staging/rtl8723au/core/rtw_recv.c
> +++ b/drivers/staging/rtl8723au/core/rtw_recv.c
> @@ -104,21 +104,14 @@ void _rtw_free_recv_priv23a(struct recv_priv *precvpriv)
>  struct recv_frame *rtw_alloc_recvframe23a(struct rtw_queue *pfree_recv_queue)
>  {
>  	struct recv_frame *pframe;
> -	struct list_head *plist, *phead;
>  	struct rtw_adapter *padapter;
>  	struct recv_priv *precvpriv;
>  
>  	spin_lock_bh(&pfree_recv_queue->lock);
>  
> -	if (list_empty(&pfree_recv_queue->queue))
> -		pframe = NULL;
> -	else {
> -		phead = get_list_head(pfree_recv_queue);
> -
> -		plist = phead->next;
> -
> -		pframe = container_of(plist, struct recv_frame, list);
> -
> +	pframe = list_first_entry_or_null(&pfree_recv_queue->queue,
> +					  struct recv_frame, list);
> +	if (pframe) {
>  		list_del_init(&pframe->list);
>  		padapter = pframe->adapter;
>  		if (padapter) {
> @@ -243,25 +236,17 @@ int rtw_enqueue_recvbuf23a(struct recv_buf *precvbuf, struct rtw_queue *queue)
>  	return _SUCCESS;
>  }
>  
> -struct recv_buf *rtw_dequeue_recvbuf23a (struct rtw_queue *queue)
> +struct recv_buf *rtw_dequeue_recvbuf23a(struct rtw_queue *queue)
>  {
>  	unsigned long irqL;
>  	struct recv_buf *precvbuf;
> -	struct list_head *plist, *phead;
>  
>  	spin_lock_irqsave(&queue->lock, irqL);
>  
> -	if (list_empty(&queue->queue)) {
> -		precvbuf = NULL;
> -	} else {
> -		phead = get_list_head(queue);
> -
> -		plist = phead->next;
> -
> -		precvbuf = container_of(plist, struct recv_buf, list);
> -
> +	precvbuf = list_first_entry_or_null(&queue->queue,
> +					    struct recv_buf, list);
> +	if (precvbuf)
>  		list_del_init(&precvbuf->list);
> -	}
>  
>  	spin_unlock_irqrestore(&queue->lock, irqL);
>  
> @@ -1079,22 +1064,17 @@ static int validate_recv_ctrl_frame(struct rtw_adapter *padapter,
>  
>  		if ((psta->state & WIFI_SLEEP_STATE) &&
>  		    (pstapriv->sta_dz_bitmap & CHKBIT(psta->aid))) {
> -			struct list_head *xmitframe_plist, *xmitframe_phead;
> +			struct list_head *xmitframe_phead;
>  			struct xmit_frame *pxmitframe;
>  			struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
>  
>  			spin_lock_bh(&pxmitpriv->lock);
>  
>  			xmitframe_phead = get_list_head(&psta->sleep_q);
> -			xmitframe_plist = xmitframe_phead->next;
> -
> -			if (!list_empty(xmitframe_phead)) {
> -				pxmitframe = container_of(xmitframe_plist,
> -							  struct xmit_frame,
> -							  list);
> -
> -				xmitframe_plist = xmitframe_plist->next;
> -
> +			pxmitframe = list_first_entry_or_null(xmitframe_phead,
> +							      struct xmit_frame,
> +							      list);
> +			if (pxmitframe) {
>  				list_del_init(&pxmitframe->list);
>  
>  				psta->sleepq_len--;
> @@ -1542,7 +1522,7 @@ struct recv_frame *recvframe_defrag(struct rtw_adapter *adapter,
>  struct recv_frame *recvframe_defrag(struct rtw_adapter *adapter,
>  				    struct rtw_queue *defrag_q)
>  {
> -	struct list_head *plist, *phead;
> +	struct list_head *phead;
>  	u8 wlanhdr_offset;
>  	u8 curfragnum;
>  	struct recv_frame *pnfhdr, *ptmp;
> @@ -1554,8 +1534,7 @@ struct recv_frame *recvframe_defrag(struct rtw_adapter *adapter,
>  	pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
>  
>  	phead = get_list_head(defrag_q);
> -	plist = phead->next;
> -	prframe = container_of(plist, struct recv_frame, list);
> +	prframe = list_first_entry(phead, struct recv_frame, list);
>  	list_del_init(&prframe->list);
>  	skb = prframe->pkt;
>  
> diff --git a/drivers/staging/rtl8723au/core/rtw_xmit.c b/drivers/staging/rtl8723au/core/rtw_xmit.c
> index b82b182..3de40cf 100644
> --- a/drivers/staging/rtl8723au/core/rtw_xmit.c
> +++ b/drivers/staging/rtl8723au/core/rtw_xmit.c
> @@ -1443,24 +1443,18 @@ Must be very very cautious...
>  */
>  static struct xmit_frame *rtw_alloc_xmitframe(struct xmit_priv *pxmitpriv)
>  {
> -	struct xmit_frame *pxframe = NULL;
> -	struct list_head *plist, *phead;
> +	struct xmit_frame *pxframe;
>  	struct rtw_queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
>  
>  	spin_lock_bh(&pfree_xmit_queue->lock);
>  
> -	if (list_empty(&pfree_xmit_queue->queue)) {
> +	pxframe = list_first_entry_or_null(&pfree_xmit_queue->queue,
> +					   struct xmit_frame, list);
> +	if (!pxframe) {
>  		RT_TRACE(_module_rtl871x_xmit_c_, _drv_info_,
>  			 "rtw_alloc_xmitframe:%d\n",
>  			 pxmitpriv->free_xmitframe_cnt);
> -		pxframe =  NULL;
>  	} else {
> -		phead = get_list_head(pfree_xmit_queue);
> -
> -		plist = phead->next;
> -
> -		pxframe = container_of(plist, struct xmit_frame, list);
> -
>  		list_del_init(&pxframe->list);
>  		pxmitpriv->free_xmitframe_cnt--;
>  		RT_TRACE(_module_rtl871x_xmit_c_, _drv_info_,
> @@ -1477,22 +1471,18 @@ static struct xmit_frame *rtw_alloc_xmitframe(struct xmit_priv *pxmitpriv)
>  
>  struct xmit_frame *rtw_alloc_xmitframe23a_ext(struct xmit_priv *pxmitpriv)
>  {
> -	struct xmit_frame *pxframe = NULL;
> -	struct list_head *plist, *phead;
> +	struct xmit_frame *pxframe;
>  	struct rtw_queue *queue = &pxmitpriv->free_xframe_ext_queue;
>  
>  	spin_lock_bh(&queue->lock);
>  
> -	if (list_empty(&queue->queue)) {
> +	pxframe = list_first_entry_or_null(&queue->queue,
> +					   struct xmit_frame, list);
> +	if (!pxframe) {
>  		RT_TRACE(_module_rtl871x_xmit_c_, _drv_info_,
>  			 "rtw_alloc_xmitframe23a_ext:%d\n",
>  			 pxmitpriv->free_xframe_ext_cnt);
> -		pxframe =  NULL;
>  	} else {
> -		phead = get_list_head(queue);
> -		plist = phead->next;
> -		pxframe = container_of(plist, struct xmit_frame, list);
> -
>  		list_del_init(&pxframe->list);
>  		pxmitpriv->free_xframe_ext_cnt--;
>  		RT_TRACE(_module_rtl871x_xmit_c_, _drv_info_,