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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97EE2EE0217 for ; Thu, 14 Sep 2023 01:56:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234284AbjINB4Q (ORCPT ); Wed, 13 Sep 2023 21:56:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234072AbjINBzq (ORCPT ); Wed, 13 Sep 2023 21:55:46 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F06C1BDA; Wed, 13 Sep 2023 18:55:36 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 67831C4339A; Thu, 14 Sep 2023 01:55:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694656535; bh=CMgqSXeu39equ/IeQc9QMRMfTv48bjmXevTlznhYML4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qEtStP6VsbgL1CF9f8sNJxIO01xV8CH5jbME5R9hZoEeWiAc+R53afw4rsIX2grLE BmbI3eGFEbJWr0aoFVN+zDZy/yD2u3e9mL4JFAgvbFuNRrLsCTGQTWyMOBtbxdQXXg h+btGZvKA5MzNSD7qJFyD5zf2mZ7YmkDIbRWjN2ekDIaiBBHwzI6km+R9r/9QC0HOX /f/WHDwhGL/XWR8A6eICDovAdLhA77ttbW9NdHqfeGU0MLGQljtGYMvuonwd/kid7g ryYaJpZsZPzJG7iSW5dn/YoGJJ2JSfxWLBcZRYQBqlX52q4LOdB5cmUgDb4Y0ha+wN E39rsfVh4Vs3A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tobias Schramm , Mark Brown , Sasha Levin , wens@csie.org, jernej.skrabec@gmail.com, samuel@sholland.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: [PATCH AUTOSEL 6.1 6/6] spi: sun6i: fix race between DMA RX transfer completion and RX FIFO drain Date: Wed, 13 Sep 2023 21:55:16 -0400 Message-Id: <20230914015523.51894-6-sashal@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230914015523.51894-1-sashal@kernel.org> References: <20230914015523.51894-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.53 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tobias Schramm [ Upstream commit 1f11f4202caf5710204d334fe63392052783876d ] Previously the transfer complete IRQ immediately drained to RX FIFO to read any data remaining in FIFO to the RX buffer. This behaviour is correct when dealing with SPI in interrupt mode. However in DMA mode the transfer complete interrupt still fires as soon as all bytes to be transferred have been stored in the FIFO. At that point data in the FIFO still needs to be picked up by the DMA engine. Thus the drain procedure and DMA engine end up racing to read from RX FIFO, corrupting any data read. Additionally the RX buffer pointer is never adjusted according to DMA progress in DMA mode, thus calling the RX FIFO drain procedure in DMA mode is a bug. Fix corruptions in DMA RX mode by draining RX FIFO only in interrupt mode. Also wait for completion of RX DMA when in DMA mode before returning to ensure all data has been copied to the supplied memory buffer. Signed-off-by: Tobias Schramm Link: https://lore.kernel.org/r/20230827152558.5368-3-t.schramm@manjaro.org Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-sun6i.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c index 2bfe87873edb3..d79853ba7792a 100644 --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c @@ -95,6 +95,7 @@ struct sun6i_spi { struct reset_control *rstc; struct completion done; + struct completion dma_rx_done; const u8 *tx_buf; u8 *rx_buf; @@ -189,6 +190,13 @@ static size_t sun6i_spi_max_transfer_size(struct spi_device *spi) return SUN6I_MAX_XFER_SIZE - 1; } +static void sun6i_spi_dma_rx_cb(void *param) +{ + struct sun6i_spi *sspi = param; + + complete(&sspi->dma_rx_done); +} + static int sun6i_spi_prepare_dma(struct sun6i_spi *sspi, struct spi_transfer *tfr) { @@ -213,6 +221,8 @@ static int sun6i_spi_prepare_dma(struct sun6i_spi *sspi, DMA_PREP_INTERRUPT); if (!rxdesc) return -EINVAL; + rxdesc->callback_param = sspi; + rxdesc->callback = sun6i_spi_dma_rx_cb; } txdesc = NULL; @@ -268,6 +278,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master, return -EINVAL; reinit_completion(&sspi->done); + reinit_completion(&sspi->dma_rx_done); sspi->tx_buf = tfr->tx_buf; sspi->rx_buf = tfr->rx_buf; sspi->len = tfr->len; @@ -426,6 +437,22 @@ static int sun6i_spi_transfer_one(struct spi_master *master, start = jiffies; timeout = wait_for_completion_timeout(&sspi->done, msecs_to_jiffies(tx_time)); + + if (!use_dma) { + sun6i_spi_drain_fifo(sspi); + } else { + if (timeout && rx_len) { + /* + * Even though RX on the peripheral side has finished + * RX DMA might still be in flight + */ + timeout = wait_for_completion_timeout(&sspi->dma_rx_done, + timeout); + if (!timeout) + dev_warn(&master->dev, "RX DMA timeout\n"); + } + } + end = jiffies; if (!timeout) { dev_warn(&master->dev, @@ -453,7 +480,6 @@ static irqreturn_t sun6i_spi_handler(int irq, void *dev_id) /* Transfer complete */ if (status & SUN6I_INT_CTL_TC) { sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_TC); - sun6i_spi_drain_fifo(sspi); complete(&sspi->done); return IRQ_HANDLED; } @@ -611,6 +637,7 @@ static int sun6i_spi_probe(struct platform_device *pdev) } init_completion(&sspi->done); + init_completion(&sspi->dma_rx_done); sspi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); if (IS_ERR(sspi->rstc)) { -- 2.40.1