Received: by 2002:a05:6a10:a841:0:0:0:0 with SMTP id d1csp43797pxy; Wed, 21 Apr 2021 17:59:46 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzv2BOyOCOOH0uwjJgOstnT8JSiihsclP2wUwrjqd54yenFYYSjBWE88BeOat8yV14I3ZQB X-Received: by 2002:a17:90a:ea86:: with SMTP id h6mr14387331pjz.52.1619053186667; Wed, 21 Apr 2021 17:59:46 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1619053186; cv=none; d=google.com; s=arc-20160816; b=EwrF28Jn/HxWUhpCNjmCwNjs4utupmgknNLqD2pgpuxE0fTHemhb3qWx4kymOEDQlY N4p0e8aO6Vh3hdeN/M+gHnrK1ViIg0zkkewfPMETXdsySYTemelS103exm1Rc3JJg4ll Wk4OBaMA1+g1D8MTJjxoHxTKvUP42xylsQC4CtuV4Qq0TJ0Zo00Ss1fB0PPv114mSZJB TTjGl1w83h6JbrHpFyKyqtT2NJivVAcylpYBuxiNsC5uxoxLhly4YcezfKEyRMIwL3BF upWRBf1wHHbnoBkBNnsnIZbjOClQfz78Su59b/TUyqdCAXsBAe+d7VIJDRNve4FQMBrm 5q+Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:from:subject:cc:to:message-id:date; bh=PAXffBO0PG50CHBSj2bljGB7ZZWQVnszFPZHXt4EW6c=; b=Z6O2sVXqlJJCoEcBAPOwN30QUjKTVgXOfuGACATDT8KJ6V8zk8fz+z/2wf1Mer1nnf B25LDS1jRb87meWIEYWj04D2m9mtSMAZr0z47z8+MIelpYn4jfSX7iODFlyLjzJfxtnn i1+q46XvpjMNrk3gccEiqs97D6OmSPIjuUPK1Tgz8pQEeGX5pqoC8zkxfE93lt/lRJ/X dsJXp6m6wVd/GjeWKYMfd9zrBsGJFcHfJxNuHKqqLZx2snYQXZwfAFzhgApMsWLixGfW jllakGhPL841dCvIx7VET6GbY5M2ZzF6Jpc7x2h4PtPVbk4+zCS2r+NI0cRq7jcCmENA 9VSg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id a12si1524822pfg.46.2021.04.21.17.59.34; Wed, 21 Apr 2021 17:59:46 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244464AbhDUQ4y (ORCPT + 99 others); Wed, 21 Apr 2021 12:56:54 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:32898 "EHLO mail.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241421AbhDUQ4x (ORCPT ); Wed, 21 Apr 2021 12:56:53 -0400 Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) by mail.monkeyblade.net (Postfix) with ESMTPSA id A79C74D2493BF; Wed, 21 Apr 2021 09:56:19 -0700 (PDT) Date: Wed, 21 Apr 2021 09:56:15 -0700 (PDT) Message-Id: <20210421.095615.459544163755192519.davem@davemloft.net> To: johan@kernel.org Cc: gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 23/26] serial: sunsu: drop low-latency workaround From: David Miller In-Reply-To: <20210421095509.3024-24-johan@kernel.org> References: <20210421095509.3024-1-johan@kernel.org> <20210421095509.3024-24-johan@kernel.org> X-Mailer: Mew version 6.8 on Emacs 27.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.2 (mail.monkeyblade.net [0.0.0.0]); Wed, 21 Apr 2021 09:56:19 -0700 (PDT) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold Date: Wed, 21 Apr 2021 11:55:06 +0200 > The sunsu driver has been carrying a workaround for the infamous > low_latency behaviour of tty_flip_buffer_push() by dropping and > reacquiring the port lock in the interrupt handler since 2004. > > Since commit a9c3f68f3cd8 ("tty: Fix low_latency BUG"), > tty_flip_buffer_push() always schedules a work item to push data to the > line discipline and there's no need to keep any low_latency hacks around. > > Cc: "David S. Miller" > Signed-off-by: Johan Hovold Acked-by: David S. Miller