linux-kernel - [PATCH v2] Staging: rtl8188eu: core: rtw_ap: Use list_for_each_entry

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Date:   Wed,  4 Oct 2017 22:44:55 +0530
From:   Srishti Sharma <srishtishar@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com,
        Srishti Sharma <srishtishar@...il.com>
Subject: [PATCH v2] Staging: rtl8188eu: core: rtw_ap: Use list_for_each_entry_safe

This is a cleanup patch and doesn't change runtime behaviour. It 
changes an open coded list traversal to use list_for_each_entry_safe.
Done using the following semantic patch by coccinelle.

@r@
struct list_head* l;
expression e;
identifier m,list_del_init,f;
type T1;
T1* pos;
iterator name list_for_each_entry_safe;
@@

f(...){

+T1* tmp;
<+...
-while(...)
+list_for_each_entry_safe(pos,tmp,l,m)
{
...
-pos = container_of(l,T1,m);
...
-l=e;
 <+...
 list_del_init(&pos->m)
 ...+>
}
...+>

}

Signed-off-by: Srishti Sharma <srishtishar@...il.com>
---
Changes in v2
 -Make commit message more clear.
 -Add file name to the subject.

 drivers/staging/rtl8188eu/core/rtw_ap.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_ap.c b/drivers/staging/rtl8188eu/core/rtw_ap.c
index a2c599f..551af9e 100644
--- a/drivers/staging/rtl8188eu/core/rtw_ap.c
+++ b/drivers/staging/rtl8188eu/core/rtw_ap.c
@@ -280,7 +280,7 @@ void	expire_timeout_chk(struct adapter *padapter)
 {
 	struct list_head *phead, *plist;
 	u8 updated = 0;
-	struct sta_info *psta = NULL;
+	struct sta_info *psta = NULL, *tmp;
 	struct sta_priv *pstapriv = &padapter->stapriv;
 	u8 chk_alive_num = 0;
 	char chk_alive_list[NUM_STA];
@@ -292,10 +292,7 @@ void	expire_timeout_chk(struct adapter *padapter)
 	plist = phead->next;
 
 	/* check auth_queue */
-	while (phead != plist) {
-		psta = container_of(plist, struct sta_info, auth_list);
-		plist = plist->next;
-
+	list_for_each_entry_safe(psta, tmp, plist, auth_list) {
 		if (psta->expire_to > 0) {
 			psta->expire_to--;
 			if (psta->expire_to == 0) {
@@ -326,10 +323,7 @@ void	expire_timeout_chk(struct adapter *padapter)
 	plist = phead->next;
 
 	/* check asoc_queue */
-	while (phead != plist) {
-		psta = container_of(plist, struct sta_info, asoc_list);
-		plist = plist->next;
-
+	list_for_each_entry_safe(psta, tmp, plist, asoc_list) {
 		if (chk_sta_is_alive(psta) || !psta->expire_to) {
 			psta->expire_to = pstapriv->expire_to;
 			psta->keep_alive_trycnt = 0;
-- 
2.7.4