From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38184 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728281AbeICVOi (ORCPT ); Mon, 3 Sep 2018 17:14:38 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sudarsana Reddy Kalluru , Ariel Elior , Michal Kalderon , "David S. Miller" , Sasha Levin Subject: [PATCH 4.4 19/80] qed: Fix possible race for the link state value. Date: Mon, 3 Sep 2018 18:48:57 +0200 Message-Id: <20180903164934.929014698@linuxfoundation.org> In-Reply-To: <20180903164934.171677301@linuxfoundation.org> References: <20180903164934.171677301@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sudarsana Reddy Kalluru [ Upstream commit 58874c7b246109d8efb2b0099d1aa296d6bfc3fa ] There's a possible race where driver can read link status in mid-transition and see that virtual-link is up yet speed is 0. Since in this mid-transition we're guaranteed to see a mailbox from MFW soon, we can afford to treat this as link down. Fixes: cc875c2e ("qed: Add link support") Signed-off-by: Sudarsana Reddy Kalluru Signed-off-by: Ariel Elior Signed-off-by: Michal Kalderon Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/qlogic/qed/qed_mcp.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c +++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c @@ -420,6 +420,7 @@ static void qed_mcp_handle_link_change(s break; default: p_link->speed = 0; + p_link->link_up = 0; } /* Correct speed according to bandwidth allocation */