From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50604 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932221AbdK0RHn (ORCPT ); Mon, 27 Nov 2017 12:07:43 -0500 Subject: Patch "igbvf: Use smp_rmb rather than read_barrier_depends" has been added to the 3.18-stable tree To: brking@linux.vnet.ibm.com, aaron.f.brown@intel.com, gregkh@linuxfoundation.org, jeffrey.t.kirsher@intel.com, jesse.brandeburg@intel.com Cc: , From: Date: Mon, 27 Nov 2017 18:07:42 +0100 Message-ID: <15118024629724@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 igbvf: Use smp_rmb rather than read_barrier_depends to the 3.18-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: igbvf-use-smp_rmb-rather-than-read_barrier_depends.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 1e1f9ca546556e508d021545861f6b5fc75a95fe Mon Sep 17 00:00:00 2001 From: Brian King Date: Fri, 17 Nov 2017 11:05:46 -0600 Subject: igbvf: Use smp_rmb rather than read_barrier_depends From: Brian King commit 1e1f9ca546556e508d021545861f6b5fc75a95fe upstream. The original issue being fixed in this patch was seen with the ixgbe driver, but the same issue exists with igbvf as well, as the code is very similar. read_barrier_depends is not sufficient to ensure loads following it are not speculatively loaded out of order by the CPU, which can result in stale data being loaded, causing potential system crashes. Signed-off-by: Brian King Acked-by: Jesse Brandeburg Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/intel/igbvf/netdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/ethernet/intel/igbvf/netdev.c +++ b/drivers/net/ethernet/intel/igbvf/netdev.c @@ -808,7 +808,7 @@ static bool igbvf_clean_tx_irq(struct ig break; /* prevent any other reads prior to eop_desc */ - read_barrier_depends(); + smp_rmb(); /* if DD is not set pending work has not been completed */ if (!(eop_desc->wb.status & cpu_to_le32(E1000_TXD_STAT_DD))) Patches currently in stable-queue which might be from brking@linux.vnet.ibm.com are queue-3.18/i40evf-use-smp_rmb-rather-than-read_barrier_depends.patch queue-3.18/igb-use-smp_rmb-rather-than-read_barrier_depends.patch queue-3.18/ixgbevf-use-smp_rmb-rather-than-read_barrier_depends.patch queue-3.18/igbvf-use-smp_rmb-rather-than-read_barrier_depends.patch queue-3.18/fm10k-use-smp_rmb-rather-than-read_barrier_depends.patch queue-3.18/ixgbe-fix-skb-list-corruption-on-power-systems.patch queue-3.18/i40e-use-smp_rmb-rather-than-read_barrier_depends.patch