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Message-ID: <wrfjio1gp2uk.fsf@redhat.com>
Date: Mon, 22 Feb 2016 21:39:15 -0500
From: Jes Sorensen <Jes.Sorensen@...hat.com>
To: Geliang Tang <geliangtang@....com>
Cc: Larry Finger <Larry.Finger@...inger.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Julian Calaby <julian.calaby@...il.com>,
linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8723au: use list_first_entry*
Geliang Tang <geliangtang@....com> writes:
> Use list_first_entry*() instead of container_of() to simplify the code.
>
> Signed-off-by: Geliang Tang <geliangtang@....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@...hat.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_,
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