linux-kernel - [PATCH 5.4 033/144] spi: spi-fsl-dspi: Fix issue with uninitialized dma_slave

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Message-Id: <20210913131049.061021509@linuxfoundation.org>
Date:   Mon, 13 Sep 2021 15:13:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sanchayan Maity <maitysanchayan@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 033/144] spi: spi-fsl-dspi: Fix issue with uninitialized dma_slave_config

From: Tony Lindgren <tony@...mide.com>

[ Upstream commit 209ab223ad5b18e437289235e3bde12593b94ac4 ]

Depending on the DMA driver being used, the struct dma_slave_config may
need to be initialized to zero for the unused data.

For example, we have three DMA drivers using src_port_window_size and
dst_port_window_size. If these are left uninitialized, it can cause DMA
failures.

For spi-fsl-dspi, this is probably not currently an issue but is still
good to fix though.

Fixes: 90ba37033cb9 ("spi: spi-fsl-dspi: Add DMA support for Vybrid")
Cc: Sanchayan Maity <maitysanchayan@...il.com>
Cc: Vladimir Oltean <vladimir.oltean@....com>
Cc: Peter Ujfalusi <peter.ujfalusi@...il.com>
Cc: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Acked-by: Vladimir Oltean <vladimir.oltean@....com>
Link: https://lore.kernel.org/r/20210810081727.19491-1-tony@atomide.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-fsl-dspi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 40dccc580e86..3e0200618af3 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -423,6 +423,7 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
 		goto err_rx_dma_buf;
 	}
 
+	memset(&cfg, 0, sizeof(cfg));
 	cfg.src_addr = phy_addr + SPI_POPR;
 	cfg.dst_addr = phy_addr + SPI_PUSHR;
 	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-- 
2.30.2