netdev - [PATCH net-next 03/15] net: dsa: mv88e6xxx: Replace usage of found with dedicated iterator

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Message-Id: <20220407102900.3086255-4-jakobkoschel@gmail.com>
Date:   Thu,  7 Apr 2022 12:28:48 +0200
From:   Jakob Koschel <jakobkoschel@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Ariel Elior <aelior@...vell.com>,
        Manish Chopra <manishc@...vell.com>,
        Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Casper Andersson <casper.casan@...il.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Colin Ian King <colin.king@...el.com>,
        Michael Walle <michael@...le.cc>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Arnd Bergmann <arnd@...db.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Di Zhu <zhudi21@...wei.com>, Xu Wang <vulab@...as.ac.cn>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, Mike Rapoport <rppt@...nel.org>,
        "Brian Johannesmeyer" <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>
Subject: [PATCH net-next 03/15] net: dsa: mv88e6xxx: Replace usage of found with dedicated iterator

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/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 64f4fdd02902..f254f537c357 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1381,28 +1381,27 @@ static int mv88e6xxx_set_mac_eee(struct dsa_switch *ds, int port,
 /* Mask of the local ports allowed to receive frames from a given fabric port */
 static u16 mv88e6xxx_port_vlan(struct mv88e6xxx_chip *chip, int dev, int port)
 {
+	struct dsa_port *dp = NULL, *iter, *other_dp;
 	struct dsa_switch *ds = chip->ds;
 	struct dsa_switch_tree *dst = ds->dst;
-	struct dsa_port *dp, *other_dp;
-	bool found = false;
 	u16 pvlan;
 
 	/* dev is a physical switch */
 	if (dev <= dst->last_switch) {
-		list_for_each_entry(dp, &dst->ports, list) {
-			if (dp->ds->index == dev && dp->index == port) {
-				/* dp might be a DSA link or a user port, so it
+		list_for_each_entry(iter, &dst->ports, list) {
+			if (iter->ds->index == dev && iter->index == port) {
+				/* iter might be a DSA link or a user port, so it
 				 * might or might not have a bridge.
-				 * Use the "found" variable for both cases.
+				 * Set the "dp" variable for both cases.
 				 */
-				found = true;
+				dp = iter;
 				break;
 			}
 		}
 	/* dev is a virtual bridge */
 	} else {
-		list_for_each_entry(dp, &dst->ports, list) {
-			unsigned int bridge_num = dsa_port_bridge_num_get(dp);
+		list_for_each_entry(iter, &dst->ports, list) {
+			unsigned int bridge_num = dsa_port_bridge_num_get(iter);
 
 			if (!bridge_num)
 				continue;
@@ -1410,13 +1409,13 @@ static u16 mv88e6xxx_port_vlan(struct mv88e6xxx_chip *chip, int dev, int port)
 			if (bridge_num + dst->last_switch != dev)
 				continue;
 
-			found = true;
+			dp = iter;
 			break;
 		}
 	}
 
 	/* Prevent frames from unknown switch or virtual bridge */
-	if (!found)
+	if (!dp)
 		return 0;
 
 	/* Frames from DSA links and CPU ports can egress any local port */
-- 
2.25.1