From: Tony Lindgren tony@atomide.com
stable inclusion from linux-4.19.207 commit bcc9379c761f4b94bd09aeb57cd7974443baee5d
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[ 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@gmail.com Cc: Vladimir Oltean vladimir.oltean@nxp.com Cc: Peter Ujfalusi peter.ujfalusi@gmail.com Cc: Vinod Koul vkoul@kernel.org Signed-off-by: Tony Lindgren tony@atomide.com Acked-by: Vladimir Oltean vladimir.oltean@nxp.com Link: https://lore.kernel.org/r/20210810081727.19491-1-tony@atomide.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- 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 25486ee8379b6..cfbf1ffb61bff 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -430,6 +430,7 @@ 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;