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=-4.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 498E9C433ED for ; Thu, 13 May 2021 14:19:26 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 05FEB610A0 for ; Thu, 13 May 2021 14:19:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 05FEB610A0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nMRu/J/DSbanSgwC44qn85RqbiKRnfcUfOtbEncOa7A=; b=aHsJ8L37bsL/UKlAkMEoNNSWL H3UDtW1vYof+zya0fS8L0/fPhcfpB3dGLq26Tmla25sve07B+T05EtrDKbPrWgg+OKCOhu6XXUryF CzqzRO3cGXv6jMaLAUshrfEhi6dVOJiEMZaTipVhbdrNnobHO74fld3Ef/q6JLYFd7csgaAU0dZh8 1JwbTLjMVXL2aVG3KEMScbHIhzOcej8UBLZRDwefBskAWZFUswzJpmJH15Jk2s8RG945YB2o+r8zb YMZIwrIq+8ygv/UderWlf3IfHnUxBc2Vf8W9bAFjU4kOdXR/AB1MSgsVpYv9lwivU+K/SvVmVzxRx SKVtU2oWA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lhC9X-005iXm-UV; Thu, 13 May 2021 14:17:28 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lhC9W-005iX4-8A for linux-arm-kernel@desiato.infradead.org; Thu, 13 May 2021 14:17:26 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=B1JFNd7gTKvI0sGEa8K5Vr6v9wvPoN/ym/YKq2DThTc=; b=vFPOv9gMEvzXlpRbQMz2028GQV jopiaKs+Rq/gLBNZmu54TwAIokd2rtDOZiDuXNcHgQpMUtbv6Zc2BvJXIN7nksFutrEexCL0gBugd /lIWTXNDc16stXsSImaW+RtT+/IR5DxKnUzk+D22meN9tkyaqx12E6DOQq8pvZAtdr57qI/C7mxiZ EmmP2NgmvP93ky5xz4E0CuLwy6+roDdtaFTkTJPdWla/MTsFaHdYCZTjBOvwwz4EFw4lwBM13ROX6 LJRCLRCevIHo1B36Bu33TZM/KqOZFntG3RLWr4zIJxcE5WSddAV64K77w6cWoc8jaHyVlTmEOdb+J CghEjHgQ==; Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lhC9T-00BJGM-Pr for linux-arm-kernel@lists.infradead.org; Thu, 13 May 2021 14:17:25 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 142CE610A0; Thu, 13 May 2021 14:17:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620915442; bh=oBkjwdnAfppQ79hZyBQaHyEMr254MTYht/meZLJAluw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=KmdHvui9b1vt//AQbpZ9eeQe3jq/sS/C0dJY30OktwbqsTrj9obklyndGaeLR/9vq CUEDtaVMXYVlvGKyF+4TmIUUtcJOUH5UlexBtzdIOy3OqlVG7j/xp0inf0lKVF8TQq LwdZis/AHRiyufEqsYHs5M2PlqRg5yZMv0Snb024= Date: Thu, 13 May 2021 16:17:20 +0200 From: Greg Kroah-Hartman To: Vignesh Raghavendra Cc: Jiri Slaby , Jan Kiszka , linux-serial@vger.kernel.org, linux-omap@vger.kernel.org, Linux ARM Mailing List , linux-kernel@vger.kernel.org Subject: Re: [PATCH] serial: 8250: 8250_omap: Fix possible interrupt storm Message-ID: References: <20210511151955.28071-1-vigneshr@ti.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210511151955.28071-1-vigneshr@ti.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210513_071723_901771_1DD32857 X-CRM114-Status: UNSURE ( 8.75 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, May 11, 2021 at 08:49:55PM +0530, Vignesh Raghavendra wrote: > It is possible that RX TIMEOUT is signalled after RX FIFO has been > drained, in which case a dummy read of RX FIFO is required to clear RX > TIMEOUT condition. Otherwise, RX TIMEOUT condition is not cleared > leading to an interrupt storm > > Cc: stable@vger.kernel.org How far back does this need to go? What commit id does this fix? What caused this to just show up now vs. previously? thanks, greg k-h _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel