From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:56376 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751843AbeA1Qjm (ORCPT ); Sun, 28 Jan 2018 11:39:42 -0500 Subject: Patch "net/mlx5e: Fix fixpoint divide exception in mlx5e_am_stats_compare" has been added to the 4.14-stable tree To: talatb@mellanox.com, davem@davemloft.net, gregkh@linuxfoundation.org, helmut.grauer@de.ibm.com, saeedm@mellanox.com Cc: , From: Date: Sun, 28 Jan 2018 17:39:02 +0100 Message-ID: <151715754223127@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled net/mlx5e: Fix fixpoint divide exception in mlx5e_am_stats_compare to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-mlx5e-fix-fixpoint-divide-exception-in-mlx5e_am_stats_compare.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Sun Jan 28 17:35:08 CET 2018 From: Talat Batheesh Date: Sun, 21 Jan 2018 05:30:42 +0200 Subject: net/mlx5e: Fix fixpoint divide exception in mlx5e_am_stats_compare From: Talat Batheesh [ Upstream commit e58edaa4863583b54409444f11b4f80dff0af1cd ] Helmut reported a bug about division by zero while running traffic and doing physical cable pull test. When the cable unplugged the ppms become zero, so when dividing the current ppms by the previous ppms in the next dim iteration there is division by zero. This patch prevent this division for both ppms and epms. Fixes: c3164d2fc48f ("net/mlx5e: Added BW check for DIM decision mechanism") Reported-by: Helmut Grauer Signed-off-by: Talat Batheesh Signed-off-by: Saeed Mahameed Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c @@ -197,9 +197,15 @@ static int mlx5e_am_stats_compare(struct return (curr->bpms > prev->bpms) ? MLX5E_AM_STATS_BETTER : MLX5E_AM_STATS_WORSE; + if (!prev->ppms) + return curr->ppms ? MLX5E_AM_STATS_BETTER : + MLX5E_AM_STATS_SAME; + if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms)) return (curr->ppms > prev->ppms) ? MLX5E_AM_STATS_BETTER : MLX5E_AM_STATS_WORSE; + if (!prev->epms) + return MLX5E_AM_STATS_SAME; if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms)) return (curr->epms < prev->epms) ? MLX5E_AM_STATS_BETTER : Patches currently in stable-queue which might be from talatb@mellanox.com are queue-4.14/net-mlx5e-fix-fixpoint-divide-exception-in-mlx5e_am_stats_compare.patch