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Mon, 17 Oct 2022 23:25:16 -0700 From: Kartik To: , , , , , , , , , Subject: [PATCH] serial: tegra: read DMA status before terminating Date: Tue, 18 Oct 2022 11:55:11 +0530 Message-ID: <1666074311-12764-2-git-send-email-kkartik@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1666074311-12764-1-git-send-email-kkartik@nvidia.com> References: <1666074311-12764-1-git-send-email-kkartik@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT085:EE_|SN7PR12MB7273:EE_ X-MS-Office365-Filtering-Correlation-Id: 5a663629-b093-4072-052f-08dab0d18e4e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(376002)(396003)(39860400002)(136003)(346002)(451199015)(46966006)(40470700004)(36840700001)(316002)(186003)(110136005)(36756003)(2616005)(40460700003)(7696005)(26005)(2906002)(5660300002)(8936002)(83380400001)(41300700001)(86362001)(40480700001)(336012)(426003)(70206006)(70586007)(6666004)(47076005)(8676002)(921005)(82310400005)(36860700001)(82740400003)(478600001)(7636003)(356005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Oct 2022 06:25:30.7227 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5a663629-b093-4072-052f-08dab0d18e4e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT085.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7273 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To get the valid data, read DMA status before terminating the DMA. As dmaengine_terminate_all() deletes the DMA desc. Fixes: e9ea096dd225 ("serial: tegra: add serial driver") Signed-off-by: Akhil R Signed-off-by: Kartik --- drivers/tty/serial/serial-tegra.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index b7170cb9a544..2779b4491f02 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -619,8 +619,8 @@ static void tegra_uart_stop_tx(struct uart_port *u) if (tup->tx_in_progress != TEGRA_UART_TX_DMA) return; - dmaengine_terminate_all(tup->tx_dma_chan); dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state); + dmaengine_terminate_all(tup->tx_dma_chan); count = tup->tx_bytes_requested - state.residue; async_tx_ack(tup->tx_dma_desc); uart_xmit_advance(&tup->uport, count); @@ -763,8 +763,8 @@ static void tegra_uart_terminate_rx_dma(struct tegra_uart_port *tup) return; } - dmaengine_terminate_all(tup->rx_dma_chan); dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); + dmaengine_terminate_all(tup->rx_dma_chan); tegra_uart_rx_buffer_push(tup, state.residue); tup->rx_dma_active = false; -- 2.17.1