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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Russell King , Vineeth Karumanchi , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net 1/2] net: macb: zero the link settings taprio reads back Date: Wed, 2 Sep 2026 08:05:27 +0000 Message-ID: <20260902080528.2211468-2-f@lex.la> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260902080528.2211468-1-f@lex.la> References: <20260902080528.2211468-1-f@lex.la> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" phylink_ethtool_ksettings_get() fills only what the current link mode provides. With no PHY attached it writes port and supported; on a fixed or in-band link it also writes speed and duplex, but only if base.rate_matching already reads RATE_MATCH_NONE, a field it never writes itself and so takes from the caller. The ethtool core zeroes the structure on every path into the op, so its callers never notice; the taprio path passes a stack variable and reads a speed nobody wrote. Fixes: 89934dbf169e ("net: macb: Add TAPRIO traffic scheduling support") Assisted-by: LLM Signed-off-by: Aleksei Sviridkin --- drivers/net/ethernet/cadence/macb_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/etherne= t/cadence/macb_main.c index 76ee4f506033..a43855db1e45 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -4297,7 +4297,7 @@ static int macb_taprio_setup_replace(struct net_devic= e *netdev, struct macb_queue_enst_config *enst_queue; struct tc_taprio_sched_entry *entry; struct macb *bp =3D netdev_priv(netdev); - struct ethtool_link_ksettings kset; + struct ethtool_link_ksettings kset =3D {}; struct macb_queue *queue; u32 queue_mask; u8 queue_id; --=20 2.53.0 From nobody Sat Sep 26 11:01:28 2026 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1AAC3E7BA8 for ; 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Wed, 02 Sep 2026 01:05:32 -0700 (PDT) Received: from remote-01 ([84.17.55.226]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49ce7dd5154sm17766875e9.2.2026.09.02.01.05.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Sep 2026 01:05:31 -0700 (PDT) From: Aleksei Sviridkin To: "Th\u00e9o Lebrun" Cc: Conor Dooley , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Russell King , Vineeth Karumanchi , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net 2/2] net: macb: reject an unknown link speed in the taprio setup Date: Wed, 2 Sep 2026 08:05:28 +0000 Message-ID: <20260902080528.2211468-3-f@lex.la> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260902080528.2211468-1-f@lex.la> References: <20260902080528.2211468-1-f@lex.la> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" speed is a u32, so SPEED_UNKNOWN arrives as 0xffffffff and passes the "speed <=3D 0" check. A taprio schedule installed while the link is down then has its hardware interval limit derived from that value, a limit that rounds to 1 ns, and the first entry fails with a misleading "exceeds hardware limit". Name the case instead of relying on the sign. Fixes: 89934dbf169e ("net: macb: Add TAPRIO traffic scheduling support") Assisted-by: LLM Signed-off-by: Aleksei Sviridkin --- drivers/net/ethernet/cadence/macb_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/etherne= t/cadence/macb_main.c index a43855db1e45..81530b9257b2 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -4324,7 +4324,7 @@ static int macb_taprio_setup_replace(struct net_devic= e *netdev, } =20 speed =3D kset.base.speed; - if (unlikely(speed <=3D 0)) { + if (unlikely(speed =3D=3D SPEED_UNKNOWN || !speed)) { netdev_err(netdev, "Invalid speed: %d\n", speed); return -EINVAL; } --=20 2.53.0