From patchwork Mon Mar 29 07:58:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 411507 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=-19.0 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 5CD8CC4345C for ; Mon, 29 Mar 2021 08:18:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F16D6197F for ; Mon, 29 Mar 2021 08:18:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233002AbhC2ISK (ORCPT ); Mon, 29 Mar 2021 04:18:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:58580 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233147AbhC2IQj (ORCPT ); Mon, 29 Mar 2021 04:16:39 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3B87561481; Mon, 29 Mar 2021 08:16:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617005768; bh=077RX44+BFRkNFzqSJNAS9Tt159ikzUIBovIe/UlrTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AkEQKZfjI8iuk+4TiYuDwNSuL/3LSHtT3M3QssDDsIcxxi7xe/0X4rVd2KIwSPFaA yLtLpwS3lCGntTdkG/bTnnU8omae4KcGyGnlpdTHYd3FqTFjLPqBihsI5KJ93XKkBl E0IbrRzYTQsnMpdLn1bIgejkV9oGMwCajOu4FAIs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mariusz Madej , Torin Cooper-Bennun , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.4 075/111] can: m_can: m_can_do_rx_poll(): fix extraneous msg loss warning Date: Mon, 29 Mar 2021 09:58:23 +0200 Message-Id: <20210329075617.705742867@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075615.186199980@linuxfoundation.org> References: <20210329075615.186199980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Torin Cooper-Bennun [ Upstream commit c0e399f3baf42279f48991554240af8c457535d1 ] Message loss from RX FIFO 0 is already handled in m_can_handle_lost_msg(), with netdev output included. Removing this warning also improves driver performance under heavy load, where m_can_do_rx_poll() may be called many times before this interrupt is cleared, causing this message to be output many times (thanks Mariusz Madej for this report). Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support") Link: https://lore.kernel.org/r/20210303103151.3760532-1-torin@maxiluxsystems.com Reported-by: Mariusz Madej Signed-off-by: Torin Cooper-Bennun Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- drivers/net/can/m_can/m_can.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 8a842545e3f6..cf72a7e464ec 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -501,9 +501,6 @@ static int m_can_do_rx_poll(struct net_device *dev, int quota) } while ((rxfs & RXFS_FFL_MASK) && (quota > 0)) { - if (rxfs & RXFS_RFL) - netdev_warn(dev, "Rx FIFO 0 Message Lost\n"); - m_can_read_fifo(dev, rxfs); quota--;