From patchwork Tue Aug 30 13:13:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 601757 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B4452C0502F for ; Tue, 30 Aug 2022 13:14:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230263AbiH3NOM (ORCPT ); Tue, 30 Aug 2022 09:14:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230187AbiH3NOJ (ORCPT ); Tue, 30 Aug 2022 09:14:09 -0400 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB325BAD9C; Tue, 30 Aug 2022 06:14:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1661865242; x=1693401242; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=jlOuWqXv3W1+nK5gEHgXZ0S9vII+w0v5W+k4c+5u558=; b=BiwyeUEIhJ1CBCnu0zFgxBjGeYqfP20QZVeSDACNB/dvbYVyaENFq0eE p1QKL430S50IqCC84+I2R+Yos4q1MrrKVA4IFWOtzDR+tUhg/Gd3MbDSK rbKmSRLcTuuLrGXX08lQQlLQbFq4kYsHzztWdOmMWRJql5A3XaA/mmodO hcmo7KaZ8rva8q5xdUpHx8L82ZHXN6dVab/KtEsURXzh4Mho4G8/dzAz5 CVP8U45kemfjrcCR16fPzZJQ7ddfgGohNkKp2HOYUG/RRmt0KXxnT8/7A ca8y63Pqz0eEnMNxE9ZE1RAM89qyU2XVkKeSDtC8ZnGlnr1waRWD+V1Sc A==; X-IronPort-AV: E=McAfee;i="6500,9779,10455"; a="278188163" X-IronPort-AV: E=Sophos;i="5.93,275,1654585200"; d="scan'208";a="278188163" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2022 06:14:02 -0700 X-IronPort-AV: E=Sophos;i="5.93,275,1654585200"; d="scan'208";a="672860955" Received: from arnesgom-mobl.ger.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.252.54.235]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2022 06:13:58 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: Greg Kroah-Hartman , Jiri Slaby , linux-serial@vger.kernel.org, Andy Shevchenko , Laxman Dewangan , Thierry Reding , Jonathan Hunter , Alan Cox , Stephen Warren , linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?utf-8?q?Ilpo_J=C3=A4rvinen?= , stable@vger.kernel.org, Andy Shevchenko Subject: [PATCH v2 2/3] serial: tegra: Use uart_xmit_advance(), fixes icount.tx accounting Date: Tue, 30 Aug 2022 16:13:42 +0300 Message-Id: <20220830131343.25968-3-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220830131343.25968-1-ilpo.jarvinen@linux.intel.com> References: <20220830131343.25968-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org DMA complete & stop paths did not correctly account Tx'ed characters into icount.tx. Using uart_xmit_advance() fixes the problem. Cc: # serial: Create uart_xmit_advance() Fixes: e9ea096dd225 ("serial: tegra: add serial driver") Reviewed-by: Andy Shevchenko Signed-off-by: Ilpo Järvinen --- drivers/tty/serial/serial-tegra.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index ad4f3567ff90..a5748e41483b 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -525,7 +525,7 @@ static void tegra_uart_tx_dma_complete(void *args) count = tup->tx_bytes_requested - state.residue; async_tx_ack(tup->tx_dma_desc); spin_lock_irqsave(&tup->uport.lock, flags); - xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); + uart_xmit_advance(&tup->uport, count); tup->tx_in_progress = 0; if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&tup->uport); @@ -613,7 +613,6 @@ static unsigned int tegra_uart_tx_empty(struct uart_port *u) static void tegra_uart_stop_tx(struct uart_port *u) { struct tegra_uart_port *tup = to_tegra_uport(u); - struct circ_buf *xmit = &tup->uport.state->xmit; struct dma_tx_state state; unsigned int count; @@ -624,7 +623,7 @@ static void tegra_uart_stop_tx(struct uart_port *u) dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state); count = tup->tx_bytes_requested - state.residue; async_tx_ack(tup->tx_dma_desc); - xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); + uart_xmit_advance(&tup->uport, count); tup->tx_in_progress = 0; }