From patchwork Sun Sep 20 11:23:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 258194 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=-9.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 7FEC2C43465 for ; Sun, 20 Sep 2020 11:32:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A6A320EDD for ; Sun, 20 Sep 2020 11:32:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726389AbgITLc2 (ORCPT ); Sun, 20 Sep 2020 07:32:28 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:54052 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726397AbgITLc1 (ORCPT ); Sun, 20 Sep 2020 07:32:27 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 8DD0B8030171; Sun, 20 Sep 2020 11:23:29 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RpDXG3G2kXML; Sun, 20 Sep 2020 14:23:29 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Alexey Malahov , Georgy Vlasov , Ramil Zaripov , Pavel Parkhomenko , Peter Ujfalusi , Andy Shevchenko , Andy Shevchenko , Feng Tang , Vinod Koul , , Subject: [PATCH v2 06/11] spi: dw-dma: Check DMA Tx-desc submission status Date: Sun, 20 Sep 2020 14:23:17 +0300 Message-ID: <20200920112322.24585-7-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200920112322.24585-1-Sergey.Semin@baikalelectronics.ru> References: <20200920112322.24585-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org We suggest to add the dmaengine_submit() return value test for errors. It has been unnecessary while the driver was expected to be utilized in pair with DW DMAC. But since now the driver can be used with any DMA engine, it might be useful to track the errors on DMA submissions so not miss them and get into an unpredictable driver behaviour. Signed-off-by: Serge Semin --- Changelog v2: - Replace negative conditional statements with the positive ones. - Terminate the prepared descriptors on submission errors. --- drivers/spi/spi-dw-dma.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c index 769d10ca74b4..aa3900809126 100644 --- a/drivers/spi/spi-dw-dma.c +++ b/drivers/spi/spi-dw-dma.c @@ -275,6 +275,8 @@ static struct dma_async_tx_descriptor * dw_spi_dma_submit_tx(struct dw_spi *dws, struct spi_transfer *xfer) { struct dma_async_tx_descriptor *txdesc; + dma_cookie_t cookie; + int ret; txdesc = dmaengine_prep_slave_sg(dws->txchan, xfer->tx_sg.sgl, @@ -287,7 +289,13 @@ dw_spi_dma_submit_tx(struct dw_spi *dws, struct spi_transfer *xfer) txdesc->callback = dw_spi_dma_tx_done; txdesc->callback_param = dws; - dmaengine_submit(txdesc); + cookie = dmaengine_submit(txdesc); + ret = dma_submit_error(cookie); + if (ret) { + dmaengine_terminate_sync(dws->txchan); + return NULL; + } + set_bit(TX_BUSY, &dws->dma_chan_busy); return txdesc; @@ -371,6 +379,8 @@ static struct dma_async_tx_descriptor *dw_spi_dma_submit_rx(struct dw_spi *dws, struct spi_transfer *xfer) { struct dma_async_tx_descriptor *rxdesc; + dma_cookie_t cookie; + int ret; rxdesc = dmaengine_prep_slave_sg(dws->rxchan, xfer->rx_sg.sgl, @@ -383,7 +393,13 @@ static struct dma_async_tx_descriptor *dw_spi_dma_submit_rx(struct dw_spi *dws, rxdesc->callback = dw_spi_dma_rx_done; rxdesc->callback_param = dws; - dmaengine_submit(rxdesc); + cookie = dmaengine_submit(rxdesc); + ret = dma_submit_error(cookie); + if (ret) { + dmaengine_terminate_sync(dws->rxchan); + return NULL; + } + set_bit(RX_BUSY, &dws->dma_chan_busy); return rxdesc;