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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 v2 2/2] net: macb: reject an unknown link speed in the taprio setup Date: Thu, 3 Sep 2026 12:36:52 +0000 Message-ID: <20260903123652.23900-3-f@lex.la> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260903123652.23900-1-f@lex.la> References: <20260903123652.23900-1-f@lex.la> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit speed is a u32, so SPEED_UNKNOWN arrives as 0xffffffff and passes the "speed <= 0" check, which only ever catches zero. That is what an autonegotiating link reports while it is down: the limit derived from the speed collapses to a nanosecond at most and the first entry fails with a misleading "exceeds hardware limit". Zero stays covered, it is what an interface that was never opened reports, and enst_max_hw_interval() divides by it. Say which case it was in the error. Fixes: 89934dbf169e ("net: macb: Add TAPRIO traffic scheduling support") Assisted-by: LLM Signed-off-by: Aleksei Sviridkin --- ethtool_validate_speed() accepts SPEED_UNKNOWN (and zero), so it cannot replace this check. v2: error text and message per Théo Lebrun. drivers/net/ethernet/cadence/macb_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 61838084989a..202bc688978c 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -4324,8 +4324,8 @@ static int macb_taprio_setup_replace(struct net_device *netdev, } speed = kset.base.speed; - if (unlikely(speed <= 0)) { - netdev_err(netdev, "Invalid speed: %d\n", speed); + if (unlikely(speed == SPEED_UNKNOWN || !speed)) { + netdev_err(netdev, "Invalid speed %d, link-down?\n", speed); return -EINVAL; } -- 2.53.0