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Date: Fri, 19 Jun 2020 16:32:35 +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, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Feng Tang <feng.tang@...el.com>, Mark Brown <broonie@...nel.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.4 046/101] spi: dw: Zero DMA Tx and Rx configurations on stack From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> [ Upstream commit 3cb97e223d277f84171cc4ccecab31e08b2ee7b5 ] Some DMA controller drivers do not tolerate non-zero values in the DMA configuration structures. Zero them to avoid issues with such DMA controller drivers. Even despite above this is a good practice per se. Fixes: 7063c0d942a1 ("spi/dw_spi: add DMA support") Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Acked-by: Feng Tang <feng.tang@...el.com> Cc: Feng Tang <feng.tang@...el.com> Link: https://lore.kernel.org/r/20200506153025.21441-1-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/spi/spi-dw-mid.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index bb1052e748f2..4d6434b244e2 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -155,6 +155,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, if (!xfer->tx_buf) return NULL; + memset(&txconf, 0, sizeof(txconf)); txconf.direction = DMA_MEM_TO_DEV; txconf.dst_addr = dws->dma_addr; txconf.dst_maxburst = 16; @@ -201,6 +202,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, if (!xfer->rx_buf) return NULL; + memset(&rxconf, 0, sizeof(rxconf)); rxconf.direction = DMA_DEV_TO_MEM; rxconf.src_addr = dws->dma_addr; rxconf.src_maxburst = 16; -- 2.25.1
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