From patchwork Mon Mar 29 07:58:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 411501 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=ham 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 A5154C433E0 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 909EB619C8 for ; Mon, 29 Mar 2021 08:18:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233043AbhC2ISL (ORCPT ); Mon, 29 Mar 2021 04:18:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:58584 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233149AbhC2IQk (ORCPT ); Mon, 29 Mar 2021 04:16:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 18C636044F; Mon, 29 Mar 2021 08:16:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617005771; bh=qoUxGxk9gJE2+hpBf/VZrCxTVRJNIWJ2wIMtvFpXqW4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=t7+rtNnpjzqKn3kDi0Vq6DgUOcBWZ1ZsesYJP44NN+vMcxiF0bYJtsQLgzspu0kk8 ENac1mXOiBcEFSRmstfkHtb9y10dAVUg9TG6k9ZnvZvtiIJz2y2Z5hDWudj+bIdvNR BLrdyByQMXv3g/GjfkO0Ya0dF9yZ73M7FbVqCIcU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marc Kleine-Budde , Torin Cooper-Bennun , Sasha Levin Subject: [PATCH 5.4 076/111] can: m_can: m_can_rx_peripheral(): fix RX being blocked by errors Date: Mon, 29 Mar 2021 09:58:24 +0200 Message-Id: <20210329075617.744814279@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 e98d9ee64ee2cc9b1d1a8e26610ec4d0392ebe50 ] For M_CAN peripherals, m_can_rx_handler() was called with quota = 1, which caused any error handling to block RX from taking place until the next time the IRQ handler is called. This had been observed to cause RX to be blocked indefinitely in some cases. This is fixed by calling m_can_rx_handler with a sensibly high quota. Fixes: f524f829b75a ("can: m_can: Create a m_can platform framework") Link: https://lore.kernel.org/r/20210303144350.4093750-1-torin@maxiluxsystems.com Suggested-by: Marc Kleine-Budde 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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index cf72a7e464ec..b2224113987c 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -839,7 +839,7 @@ static int m_can_rx_peripheral(struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); - m_can_rx_handler(dev, 1); + m_can_rx_handler(dev, M_CAN_NAPI_WEIGHT); m_can_enable_all_interrupts(cdev);