[PATCH] rtlwifi: replace usage of found with dedicated list iterator variable

[PATCH] rtlwifi: replace usage of found with dedicated list iterator variable

[Jakob Koschel]

To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable instead of a
found boolean [1].

This removes the need to use a found variable and simply checking if
the variable was set, can determine if the break/goto was hit.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
---
 drivers/net/wireless/realtek/rtlwifi/base.c | 13 ++++++-------
 drivers/net/wireless/realtek/rtlwifi/pci.c  | 15 +++++++--------
 2 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c
index ffd150ec181f..a7ef84f55939 100644
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -1994,8 +1994,7 @@ void rtl_collect_scan_list(struct ieee80211_hw *hw, struct sk_buff *skb)
 	struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
 	unsigned long flags;
 
-	struct rtl_bssid_entry *entry;
-	bool entry_found = false;
+	struct rtl_bssid_entry *entry = NULL, *iter;
 
 	/* check if it is scanning */
 	if (!mac->act_scanning)
@@ -2008,10 +2007,10 @@ void rtl_collect_scan_list(struct ieee80211_hw *hw, struct sk_buff *skb)
 
 	spin_lock_irqsave(&rtlpriv->locks.scan_list_lock, flags);
 
-	list_for_each_entry(entry, &rtlpriv->scan_list.list, list) {
-		if (memcmp(entry->bssid, hdr->addr3, ETH_ALEN) == 0) {
-			list_del_init(&entry->list);
-			entry_found = true;
+	list_for_each_entry(iter, &rtlpriv->scan_list.list, list) {
+		if (memcmp(iter->bssid, hdr->addr3, ETH_ALEN) == 0) {
+			list_del_init(&iter->list);
+			entry = iter;
 			rtl_dbg(rtlpriv, COMP_SCAN, DBG_LOUD,
 				"Update BSSID=%pM to scan list (total=%d)\n",
 				hdr->addr3, rtlpriv->scan_list.num);
@@ -2019,7 +2018,7 @@ void rtl_collect_scan_list(struct ieee80211_hw *hw, struct sk_buff *skb)
 		}
 	}
 
-	if (!entry_found) {
+	if (!entry) {
 		entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 
 		if (!entry)
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index ad327bae754b..8e4c15654746 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -323,14 +323,13 @@ static bool rtl_pci_check_buddy_priv(struct ieee80211_hw *hw,
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_pci_priv *pcipriv = rtl_pcipriv(hw);
-	bool find_buddy_priv = false;
-	struct rtl_priv *tpriv;
+	struct rtl_priv *tpriv = NULL, *iter;
 	struct rtl_pci_priv *tpcipriv = NULL;
 
 	if (!list_empty(&rtlpriv->glb_var->glb_priv_list)) {
-		list_for_each_entry(tpriv, &rtlpriv->glb_var->glb_priv_list,
+		list_for_each_entry(iter, &rtlpriv->glb_var->glb_priv_list,
 				    list) {
-			tpcipriv = (struct rtl_pci_priv *)tpriv->priv;
+			tpcipriv = (struct rtl_pci_priv *)iter->priv;
 			rtl_dbg(rtlpriv, COMP_INIT, DBG_LOUD,
 				"pcipriv->ndis_adapter.funcnumber %x\n",
 				pcipriv->ndis_adapter.funcnumber);
@@ -344,19 +343,19 @@ static bool rtl_pci_check_buddy_priv(struct ieee80211_hw *hw,
 			    tpcipriv->ndis_adapter.devnumber &&
 			    pcipriv->ndis_adapter.funcnumber !=
 			    tpcipriv->ndis_adapter.funcnumber) {
-				find_buddy_priv = true;
+				tpriv = iter;
 				break;
 			}
 		}
 	}
 
 	rtl_dbg(rtlpriv, COMP_INIT, DBG_LOUD,
-		"find_buddy_priv %d\n", find_buddy_priv);
+		"find_buddy_priv %d\n", tpriv != NULL);
 
-	if (find_buddy_priv)
+	if (tpriv)
 		*buddy_priv = tpriv;
 
-	return find_buddy_priv;
+	return tpriv != NULL;
 }
 
 static void rtl_pci_get_linkcontrol_field(struct ieee80211_hw *hw)

base-commit: f443e374ae131c168a065ea1748feac6b2e76613
-- 
2.25.1

RE: [PATCH] rtlwifi: replace usage of found with dedicated list iterator variable

[Pkshih]

> -----Original Message-----
> From: Jakob Koschel <jakobkoschel@gmail.com>
> Sent: Thursday, March 24, 2022 3:21 PM
> To: Pkshih <pkshih@realtek.com>
> Cc: Kalle Valo <kvalo@kernel.org>; David S. Miller <davem@davemloft.net>; Jakub Kicinski <kuba@kernel.org>;
> Paolo Abeni <pabeni@redhat.com>; linux-wireless@vger.kernel.org; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org; Mike Rapoport <rppt@kernel.org>; Brian Johannesmeyer
> <bjohannesmeyer@gmail.com>; Cristiano Giuffrida <c.giuffrida@vu.nl>; Bos, H.J. <h.j.bos@vu.nl>; Jakob
> Koschel <jakobkoschel@gmail.com>
> Subject: [PATCH] rtlwifi: replace usage of found with dedicated list iterator variable
> 
> To move the list iterator variable into the list_for_each_entry_*()
> macro in the future it should be avoided to use the list iterator
> variable after the loop body.
> 
> To *never* use the list iterator variable after the loop it was
> concluded to use a separate iterator variable instead of a
> found boolean [1].
> 
> This removes the need to use a found variable and simply checking if
> the variable was set, can determine if the break/goto was hit.
> 
> Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
> Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>

Acked-by: Ping-Ke Shih <pkshih@realtek.com>

Thanks.

[...]

Re: [PATCH] rtlwifi: replace usage of found with dedicated list iterator variable

[Kalle Valo]

Jakob Koschel <jakobkoschel@gmail.com> wrote:

> To move the list iterator variable into the list_for_each_entry_*()
> macro in the future it should be avoided to use the list iterator
> variable after the loop body.
> 
> To *never* use the list iterator variable after the loop it was
> concluded to use a separate iterator variable instead of a
> found boolean [1].
> 
> This removes the need to use a found variable and simply checking if
> the variable was set, can determine if the break/goto was hit.
> 
> Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
> Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
> Acked-by: Ping-Ke Shih <pkshih@realtek.com>

Patch applied to wireless-next.git, thanks.

a0ff2a87194a rtlwifi: replace usage of found with dedicated list iterator variable

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20220324072124.62458-1-jakobkoschel@gmail.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches