spi: spi-pic32: Fix issue with uninitialized dma_slave_config

[ Upstream commit 976c1de1de147bb7f4e0d87482f375221c05aeaf ]

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-pic32, this is probably not currently an issue but is still good to
fix though.

Fixes: 1bcb9f8ceb67 ("spi: spi-pic32: Add PIC32 SPI master driver")
Cc: Purna Chandra Mandal <purna.mandal@microchip.com>
Cc: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Cc: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210810081727.19491-2-tony@atomide.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-pic32.c b/drivers/spi/spi-pic32.c
index 9a97ad973c41693e1803450410ac1bb364e754a5..021dddf484e5b58c53d9209713028ac4acd4874e 100644 (file)
--- a/drivers/spi/spi-pic32.c
+++ b/drivers/spi/spi-pic32.c
@@ -369,6 +369,7 @@ static int pic32_spi_dma_config(struct pic32_spi *pic32s, u32 dma_width)
        struct dma_slave_config cfg;
        int ret;
 
+       memset(&cfg, 0, sizeof(cfg));
        cfg.device_fc = true;
        cfg.src_addr = pic32s->dma_base + buf_offset;
        cfg.dst_addr = pic32s->dma_base + buf_offset;