Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jakob Koschel <jakobkoschel@gmail.com>
To:     "David S. Miller" <davem@davemloft.net>
Cc:     Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        Lars Povlsen <lars.povlsen@microchip.com>,
        Steen Hegelund <Steen.Hegelund@microchip.com>,
        UNGLinuxDriver@microchip.com, Ariel Elior <aelior@marvell.com>,
        Manish Chopra <manishc@marvell.com>,
        Edward Cree <ecree.xilinx@gmail.com>,
        Martin Habets <habetsm.xilinx@gmail.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Jiri Pirko <jiri@resnulli.us>,
        Casper Andersson <casper.casan@gmail.com>,
        Bjarni Jonasson <bjarni.jonasson@microchip.com>,
        Jakob Koschel <jakobkoschel@gmail.com>,
        Colin Ian King <colin.king@intel.com>,
        Michael Walle <michael@walle.cc>,
        Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
        Arnd Bergmann <arnd@arndb.de>,
        Eric Dumazet <edumazet@google.com>,
        Di Zhu <zhudi21@huawei.com>, Xu Wang <vulab@iscas.ac.cn>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linuxppc-dev@lists.ozlabs.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>
Subject: [PATCH net-next 11/15] sfc: Remove usage of list iterator for list_add() after the loop body
Date:   Thu,  7 Apr 2022 12:28:56 +0200
Message-Id: <20220407102900.3086255-12-jakobkoschel@gmail.com>
In-Reply-To: <20220407102900.3086255-1-jakobkoschel@gmail.com>
References: <20220407102900.3086255-1-jakobkoschel@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].

Before, the code implicitly used the head when no element was found
when using &pos->list. Since the new variable is only set if an
element was found, the list_add() is performed within the loop
and only done after the loop if it is done on the list head directly.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
---
 drivers/net/ethernet/sfc/rx_common.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c
index 1b22c7be0088..a8822152ff83 100644
--- a/drivers/net/ethernet/sfc/rx_common.c
+++ b/drivers/net/ethernet/sfc/rx_common.c
@@ -563,8 +563,10 @@ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx)
 
 	/* Search for first gap in the numbering */
 	list_for_each_entry(ctx, head, list) {
-		if (ctx->user_id != id)
+		if (ctx->user_id != id) {
+			head = &ctx->list;
 			break;
+		}
 		id++;
 		/* Check for wrap.  If this happens, we have nearly 2^32
 		 * allocated RSS contexts, which seems unlikely.
@@ -582,7 +584,7 @@ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx)
 
 	/* Insert the new entry into the gap */
 	new->user_id = id;
-	list_add_tail(&new->list, &ctx->list);
+	list_add_tail(&new->list, head);
 	return new;
 }
 
-- 
2.25.1