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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2604CC004D4 for ; Sat, 21 Jan 2023 15:39:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=MiMjwe/1o6hPWbgxeB4MTI2il/ib9qMjadgk2KIIBWI=; b=ouy8pgSoPg7rHD dqeZHX9KC+8VHsnGMQdIu4ujvS+ygdoJYH0xolzgTm8NncpR5EqhTfY6GFqVdLd3kDEPMyrJAkUf7 8ywAokZ4Vp/snXvNp+y5cN9Td7BIxl7Wd2xnDOZTiZ/F5ywtr4bNmhNmru5cFN5TLtuwiUThMTYCp vQ3EV2AenpySbzQoLTq04K4tQJqxd4dZBGa4433tnuC7xU5UhlJQBmr2dN6FGpyqqZWuYXQrAw8NM NfkJhQ259TXO8qxAZFWFPSVqN5nbyI9XEQOmglIkjSbvbDqwixzbL42neXkL0IUE15IzBQ5YhQdMj bNzhA98cS9Naf/t11UAQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pJFwP-00E4Mo-Cw; Sat, 21 Jan 2023 15:38:01 +0000 Received: from mail-ej1-x62a.google.com ([2a00:1450:4864:20::62a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pJFvP-00E41r-5W for linux-arm-kernel@lists.infradead.org; Sat, 21 Jan 2023 15:37:00 +0000 Received: by mail-ej1-x62a.google.com with SMTP id hw16so20766318ejc.10 for ; Sat, 21 Jan 2023 07:36:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=WEm5A99uTG2c238a+JDBkz/mOTpdwi/bBFV9FIiWCUw=; b=hKOanOB+Jp4twUTrfXiXV8T4xU7zos4v0oiBi0NKbLmvUTU+eLWrdQvXmBhVaVndRP VMVuYgvl43SPxyS042yXS1SrdssVRlpWla7n1BLoDIGOeVeoaEnMG3VqLsUzOMHyJ7Uv hTBVuIdBBVN30aMgO3Pejg7iQ+Mo6jnmPm3SQtgKg1hJK4i1WNqQZQK/FuXjR5uIfCuw zCjSW4OTXKoTx5DKqGUzNA8Dh7YAIxlPH+UBSyfPUn4V13t/uf7+vp5REfGqWc4JOzGX lX7HTkdrO3ACsF9yAGxTZlED4Qe1cEwr1LSl6s8g8vj9dhSzj5p405tjEW4u+MtlMPxC k9Kw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=WEm5A99uTG2c238a+JDBkz/mOTpdwi/bBFV9FIiWCUw=; b=uOvB7cBkYWTQDjMgzF4o9I6i/25ryv+lDJ4AGUq/fIij6YqlX9GNyM+V/BCg4BOQl0 v9gvZfuRy59FljjkwKQxhuNSbGWtm1ItHNCE/IQ0wruCYK2F5aheH5wPuukhIAyU+wnU r+WS84uI5f3tCj6UNqNFQBCBsqHdnRsTAV3Rn+wzCkGxt1alzEG4O6EXSwqvtV7jI3qu Cvb7//I+By4BAGrbmadYtJGRRVOa3Kx/Kt6n9GrpRTFm5lVstgAaY+s7gwVWZ7mWkRnf tV9IBx0f5DuN5dGneRtgHVZm24PN25fp74WbjuZ9XsYttW9zM8e3SDnn5O2k0IkBK83H f1eA== X-Gm-Message-State: AFqh2koyu3pEYJc2L+TEhlnV+Q6SlhCOOcwkov1w2RDowQDRO4k7pxH8 TqRcVWwmlTV/pbO0OQOAUXA= X-Google-Smtp-Source: AMrXdXud2vbRhpBZTL2WdDc/3x2g68JGn78+ZaUp9GYAg6ZI1mbhN9/TQRbZhqN8NeRWcVIpiEvVxg== X-Received: by 2002:a17:906:6bc6:b0:7c0:f684:9092 with SMTP id t6-20020a1709066bc600b007c0f6849092mr18559572ejs.37.1674315417507; Sat, 21 Jan 2023 07:36:57 -0800 (PST) Received: from osv.localdomain ([89.175.180.246]) by smtp.gmail.com with ESMTPSA id vc10-20020a170907d08a00b008717a377125sm8187030ejc.85.2023.01.21.07.36.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Jan 2023 07:36:57 -0800 (PST) From: Sergey Organov To: linux-serial@vger.kernel.org Cc: Fabio Estevam , Greg Kroah-Hartman , Jiri Slaby , Richard Genoud , Sascha Hauer , Shawn Guo , Tim Harvey , =?UTF-8?q?Tomasz=20Mo=C5=84?= , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Johan Hovold , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sherry Sun , linux-arm-kernel@lists.infradead.org, NXP Linux Team , Pengutronix Kernel Team , Sergey Organov Subject: [PATCH v1 4/7] serial: imx: do not break from FIFO reading loop prematurely Date: Sat, 21 Jan 2023 18:36:36 +0300 Message-Id: <20230121153639.15402-5-sorganov@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230121153639.15402-1-sorganov@gmail.com> References: <87bko4e65y.fsf@osv.gnss.ru> <20230121153639.15402-1-sorganov@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230121_073659_262988_2D381023 X-CRM114-Status: GOOD ( 13.09 ) 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 There is no reason to prematurely break out of FIFO reading loop, and it might cause needless reenters into ISR, so keep reading until FIFO is empty. Signed-off-by: Sergey Organov --- drivers/tty/serial/imx.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index e709118fe85c..797c441088a9 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -888,7 +888,7 @@ static void imx_uart_check_flood(struct imx_port *sport, u32 usr2) static irqreturn_t __imx_uart_rxint(int irq, void *dev_id) { struct imx_port *sport = dev_id; - unsigned int rx, flg, ignored = 0; + unsigned int rx, flg; struct tty_port *port = &sport->port.state->port; u32 usr2; @@ -921,11 +921,8 @@ static irqreturn_t __imx_uart_rxint(int irq, void *dev_id) if (rx & URXD_OVRRUN) sport->port.icount.overrun++; - if (rx & sport->port.ignore_status_mask) { - if (++ignored > 100) - goto out; + if (rx & sport->port.ignore_status_mask) continue; - } rx &= (sport->port.read_status_mask | 0xFF); @@ -944,13 +941,12 @@ static irqreturn_t __imx_uart_rxint(int irq, void *dev_id) } if (sport->port.ignore_status_mask & URXD_DUMMY_READ) - goto out; + continue; if (tty_insert_flip_char(port, rx, flg) == 0) sport->port.icount.buf_overrun++; } -out: tty_flip_buffer_push(port); return IRQ_HANDLED; -- 2.30.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel