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[194.187.74.233]) by smtp.gmail.com with ESMTPSA id d24sm2492372ljj.8.2021.09.01.02.22.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Sep 2021 02:22:47 -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 2/2] net: dsa: b53: Set correct number of ports in the DSA struct Date: Wed, 1 Sep 2021 11:21:41 +0200 Message-Id: <20210901092141.6451-2-zajec5@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210901092141.6451-1-zajec5@gmail.com> References: <20210901092141.6451-1-zajec5@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Rafał Miłecki Setting DSA_MAX_PORTS caused DSA to call b53 callbacks (e.g. b53_disable_port() during dsa_register_switch()) for invalid (non-existent) ports. That made b53 modify unrelated registers and is one of reasons for a broken BCM5301x support. This problem exists for years but DSA_MAX_PORTS usage has changed few times so it's hard to specify a single commit this change fixes. Cc: stable@vger.kernel.org Signed-off-by: Rafał Miłecki --- drivers/net/dsa/b53/b53_common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c index dcf9d7e5ae14..5646eb8afe38 100644 --- a/drivers/net/dsa/b53/b53_common.c +++ b/drivers/net/dsa/b53/b53_common.c @@ -2615,6 +2615,8 @@ static int b53_switch_init(struct b53_device *dev) dev->enabled_ports |= BIT(dev->cpu_port); dev->num_ports = fls(dev->enabled_ports); + dev->ds->num_ports = min_t(unsigned int, dev->num_ports, DSA_MAX_PORTS); + /* Include non standard CPU port built-in PHYs to be probed */ if (is539x(dev) || is531x5(dev)) { for (i = 0; i < dev->num_ports; i++) { @@ -2659,7 +2661,6 @@ struct b53_device *b53_switch_alloc(struct device *base, return NULL; ds->dev = base; - ds->num_ports = DSA_MAX_PORTS; dev = devm_kzalloc(base, sizeof(*dev), GFP_KERNEL); if (!dev)