From patchwork Fri Dec 18 19:00:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Erwan LE RAY X-Patchwork-Id: 346151 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 B7D49C2BBD5 for ; Fri, 18 Dec 2020 19:02:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7B24223B83 for ; Fri, 18 Dec 2020 19:02:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726491AbgLRTB2 (ORCPT ); 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Fri, 18 Dec 2020 20:00:29 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id AF8D710002A; Fri, 18 Dec 2020 20:00:28 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id A21CE231C3D; Fri, 18 Dec 2020 20:00:28 +0100 (CET) Received: from localhost (10.75.127.49) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 18 Dec 2020 20:00:28 +0100 From: Erwan Le Ray To: Greg Kroah-Hartman , Jiri Slaby , Rob Herring , Maxime Coquelin , Alexandre Torgue CC: , , , , , Erwan Le Ray , Fabrice Gasnier , Valentin Caron Subject: [PATCH 1/8] serial: stm32: fix -Wall W=1 compilation warnings Date: Fri, 18 Dec 2020 20:00:12 +0100 Message-ID: <20201218190020.1572-2-erwan.leray@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201218190020.1572-1-erwan.leray@foss.st.com> References: <20201218190020.1572-1-erwan.leray@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG2NODE1.st.com (10.75.127.4) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2020-12-18_12:2020-12-18,2020-12-18 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org Fix compilations warning detected by -Wall W=1 compilation option: - warning: variable ‘cookie’ set but not used Fixes: 3489187204eb ("serial: stm32: adding dma support") Signed-off-by: Erwan Le Ray diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index ee6c7762d355..6248304a001f 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -350,7 +350,6 @@ static void stm32_transmit_chars_dma(struct uart_port *port) struct stm32_usart_offsets *ofs = &stm32port->info->ofs; struct circ_buf *xmit = &port->state->xmit; struct dma_async_tx_descriptor *desc = NULL; - dma_cookie_t cookie; unsigned int count, i; if (stm32port->tx_dma_busy) @@ -384,17 +383,18 @@ static void stm32_transmit_chars_dma(struct uart_port *port) DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); - if (!desc) { - for (i = count; i > 0; i--) - stm32_transmit_chars_pio(port); - return; - } + if (!desc) + goto fallback_err; desc->callback = stm32_tx_dma_complete; desc->callback_param = port; /* Push current DMA TX transaction in the pending queue */ - cookie = dmaengine_submit(desc); + if (dma_submit_error(dmaengine_submit(desc))) { + /* dma no yet started, safe to free resources */ + dmaengine_terminate_async(stm32port->tx_ch); + goto fallback_err; + } /* Issue pending DMA TX requests */ dma_async_issue_pending(stm32port->tx_ch); @@ -403,6 +403,11 @@ static void stm32_transmit_chars_dma(struct uart_port *port) xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1); port->icount.tx += count; + return; + +fallback_err: + for (i = count; i > 0; i--) + stm32_transmit_chars_pio(port); } static void stm32_transmit_chars(struct uart_port *port) @@ -1087,7 +1092,6 @@ static int stm32_of_dma_rx_probe(struct stm32_port *stm32port, struct device *dev = &pdev->dev; struct dma_slave_config config; struct dma_async_tx_descriptor *desc = NULL; - dma_cookie_t cookie; int ret; /* Request DMA RX channel */ @@ -1132,7 +1136,11 @@ static int stm32_of_dma_rx_probe(struct stm32_port *stm32port, desc->callback_param = NULL; /* Push current DMA transaction in the pending queue */ - cookie = dmaengine_submit(desc); + ret = dma_submit_error(dmaengine_submit(desc)); + if (ret) { + dmaengine_terminate_sync(stm32port->rx_ch); + goto config_err; + } /* Issue pending DMA requests */ dma_async_issue_pending(stm32port->rx_ch);