From nobody Mon Feb 9 17:35:29 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48B9AEB64D8 for ; Wed, 14 Jun 2023 14:07:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245426AbjFNOHy (ORCPT ); Wed, 14 Jun 2023 10:07:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245382AbjFNOHh (ORCPT ); Wed, 14 Jun 2023 10:07:37 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C22AF1BFD; Wed, 14 Jun 2023 07:07:35 -0700 (PDT) From: Florian Kauer DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1686751654; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7hUQE7jx0fknKMAL9e6sfNn3hoeeuEK7E2AxmOK/Kq4=; b=e1jQpj4mpNOmUjLaTWrTqzJCKoe2XCIeX84UQxj8V+Ot1GjzyK4wF2ASVXOEk692Bue4FH RF58gFTXbaZbf5YM0srXUHwnnTSdsbvEtKVutDE4fZjqwpSfxclXybP9ChEfyK+k6hlcmD iE9nPwlA/d2G61e7QBFIQIFgKiIYkr/si5Tp4oje8P3Cxw/T2mde51yLfFKrI578U6LcVy LTvwFSJobm9cE/XYKDlOVi7YAsob56NxctFPKJ/TN8ru/S4o2OWm9tMnCdzRjkQ360zZzM aUlCS/ExREN7aG7u+9vnEW67tZoepFWuWuj1veN9j7I6KviTOd7oWFFEjHzbLw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1686751654; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7hUQE7jx0fknKMAL9e6sfNn3hoeeuEK7E2AxmOK/Kq4=; b=Zp2JPID67ZKSHdcUNmB9agCGcbNECGLtbWi+KbGEHVsxXJ21kzyORuLrlHdx8fSHFz8ZBM XPAv3YOD4EkoFkBg== To: Jesse Brandeburg , Tony Nguyen , Vinicius Costa Gomes , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Tan Tee Min , Muhammad Husaini Zulkifli , Aravindhan Gunasekaran , Malli C Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kurt@linutronix.de, florian.kauer@linutronix.de Subject: [PATCH net-next 5/6] igc: Fix launchtime before start of cycle Date: Wed, 14 Jun 2023 16:07:13 +0200 Message-Id: <20230614140714.14443-6-florian.kauer@linutronix.de> In-Reply-To: <20230614140714.14443-1-florian.kauer@linutronix.de> References: <20230614140714.14443-1-florian.kauer@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" It is possible (verified on a running system) that frames are processed by igc_tx_launchtime with a txtime before the start of the cycle (baset_est). However, the result of txtime - baset_est is written into a u32, leading to a wrap around to a positive number. The following launchtime > 0 check will only branch to executing launchtime =3D 0 if launchtime is already 0. Fix it by using a s32 before checking launchtime > 0. Fixes: db0b124f02ba ("igc: Enhance Qbv scheduling by using first flag bit") Signed-off-by: Florian Kauer Reviewed-by: Kurt Kanzenbach --- drivers/net/ethernet/intel/igc/igc_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethern= et/intel/igc/igc_main.c index 35ace8d338a5..ec8649751d19 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -1010,7 +1010,7 @@ static __le32 igc_tx_launchtime(struct igc_ring *ring= , ktime_t txtime, ktime_t base_time =3D adapter->base_time; ktime_t now =3D ktime_get_clocktai(); ktime_t baset_est, end_of_cycle; - u32 launchtime; + s32 launchtime; s64 n; =20 n =3D div64_s64(ktime_sub_ns(now, base_time), cycle_time); --=20 2.39.2