From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D9F811F93D for ; Fri, 21 Jul 2023 16:13:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C687C433C7; Fri, 21 Jul 2023 16:13:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689955984; bh=ADwtXdWigSKTz4p8FBIE3IB2ugR86Bi9UXrC+ArSIHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ufx6A/z61WfKIUWFknntSEb0zbQxaDTEB65XcSaWwbw6tmRsfxHalfrXGxZIifx7a cuKehH2ahGZlFN1I+Jn4PHoL3aH0VQkughySycdaYuP6f91MhqRzwx+1iLCN2nQRaL 0W6rUqe0HHcygs5VXsWz4ZLaxEnJP607nest4yXg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Kauer , Kurt Kanzenbach , Naama Meir , Tony Nguyen , Sasha Levin Subject: [PATCH 6.4 076/292] igc: Fix launchtime before start of cycle Date: Fri, 21 Jul 2023 18:03:05 +0200 Message-ID: <20230721160532.067072275@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230721160528.800311148@linuxfoundation.org> References: <20230721160528.800311148@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Florian Kauer [ Upstream commit c1bca9ac0bcb355be11354c2e68bc7bf31f5ac5a ] 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 = 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 Tested-by: Naama Meir Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- 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/ethernet/intel/igc/igc_main.c index 97eb3c390de9a..96a2f6e6f6b8a 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -1016,7 +1016,7 @@ static __le32 igc_tx_launchtime(struct igc_ring *ring, ktime_t txtime, ktime_t base_time = adapter->base_time; ktime_t now = ktime_get_clocktai(); ktime_t baset_est, end_of_cycle; - u32 launchtime; + s32 launchtime; s64 n; n = div64_s64(ktime_sub_ns(now, base_time), cycle_time); -- 2.39.2