From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8591EC636C9 for ; Thu, 15 Jul 2021 19:07:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69D51613E0 for ; Thu, 15 Jul 2021 19:07:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242846AbhGOTJS (ORCPT ); Thu, 15 Jul 2021 15:09:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:34266 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241273AbhGOS6E (ORCPT ); Thu, 15 Jul 2021 14:58:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 097D0613E9; Thu, 15 Jul 2021 18:55:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626375308; bh=gyNbe78AFY1UzqreDnREF1h2G5X1Dv9nW1W/K3xfdW4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hx0D3QQJ110Wshk91T1U71nQK45+jfm2PAzfMiM8P6cbPvb29817nQZoZ2NA/FdYI blohLhB31GB+wcPqiDKsFPAEEInrhdqTwcSiQoDsQYmpRA7U8VNR0Z9H6R/TqCfd/+ aC+0km7Wr/I8XTBkqBUufmo86LbQBpxJVgRTuW0A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jesse Brandeburg , Dave Switzer , Tony Nguyen , Sasha Levin Subject: [PATCH 5.12 033/242] igb: fix assignment on big endian machines Date: Thu, 15 Jul 2021 20:36:35 +0200 Message-Id: <20210715182557.789971903@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210715182551.731989182@linuxfoundation.org> References: <20210715182551.731989182@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jesse Brandeburg [ Upstream commit b514958dd1a3bd57638b0e63b8e5152b1960e6aa ] The igb driver was trying hard to be sparse correct, but somehow ended up converting a variable into little endian order and then tries to OR something with it. A much plainer way of doing things is to leave all variables and OR operations in CPU (non-endian) mode, and then convert to little endian only once, which is what this change does. This probably fixes a bug that might have been seen only on big endian systems. Signed-off-by: Jesse Brandeburg Tested-by: Dave Switzer Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/igb/igb_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 894b9b87dba1..434220a342df 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6277,12 +6277,12 @@ int igb_xmit_xdp_ring(struct igb_adapter *adapter, cmd_type |= len | IGB_TXD_DCMD; tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type); - olinfo_status = cpu_to_le32(len << E1000_ADVTXD_PAYLEN_SHIFT); + olinfo_status = len << E1000_ADVTXD_PAYLEN_SHIFT; /* 82575 requires a unique index per ring */ if (test_bit(IGB_RING_FLAG_TX_CTX_IDX, &tx_ring->flags)) olinfo_status |= tx_ring->reg_idx << 4; - tx_desc->read.olinfo_status = olinfo_status; + tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status); netdev_tx_sent_queue(txring_txq(tx_ring), tx_buffer->bytecount); -- 2.30.2