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[194.187.74.233]) by smtp.gmail.com with ESMTPSA id d24sm2492372ljj.8.2021.09.01.02.22.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Sep 2021 02:22:42 -0700 (PDT) From: =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= To: Andrew Lunn , Vivien Didelot , Vladimir Oltean , "David S . Miller" , Jakub Kicinski Cc: Florian Fainelli , netdev@vger.kernel.org, =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= , stable@vger.kernel.org Subject: [PATCH net 1/2] net: dsa: b53: Fix calculating number of switch ports Date: Wed, 1 Sep 2021 11:21:40 +0200 Message-Id: <20210901092141.6451-1-zajec5@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Rafał Miłecki It isn't true that CPU port is always the last one. Switches BCM5301x have 9 ports (port 6 being inactive) and they use port 5 as CPU by default (depending on design some other may be CPU ports too). A more reliable way of determining number of ports is to check for the last set bit in the "enabled_ports" bitfield. This fixes b53 internal state, it will allow providing accurate info to the DSA and is required to fix BCM5301x support. Fixes: 967dd82ffc52 ("net: dsa: b53: Add support for Broadcom RoboSwitch") Cc: stable@vger.kernel.org Signed-off-by: Rafał Miłecki Reviewed-by: Florian Fainelli --- drivers/net/dsa/b53/b53_common.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c index bd1417a66cbf..dcf9d7e5ae14 100644 --- a/drivers/net/dsa/b53/b53_common.c +++ b/drivers/net/dsa/b53/b53_common.c @@ -2612,9 +2612,8 @@ static int b53_switch_init(struct b53_device *dev) dev->cpu_port = 5; } - /* cpu port is always last */ - dev->num_ports = dev->cpu_port + 1; dev->enabled_ports |= BIT(dev->cpu_port); + dev->num_ports = fls(dev->enabled_ports); /* Include non standard CPU port built-in PHYs to be probed */ if (is539x(dev) || is531x5(dev)) {