[PATCH 5.10 188/236] mmc: moxart: Fix issue with uninitialized dma_slave_config

[Greg Kroah-Hartman]

From: Tony Lindgren <tony@xxxxxxxxxxx>

[ Upstream commit ee5165354d498e5bceb0b386e480ac84c5f8c28c ]

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

Fixes: 1b66e94e6b99 ("mmc: moxart: Add MOXA ART SD/MMC driver")
Cc: Jonas Jensen <jonas.jensen@xxxxxxxxx>
Cc: Vinod Koul <vkoul@xxxxxxxxxx>
Cc: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210810081644.19353-3-tony@xxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/mmc/host/moxart-mmc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c
index f25079ba3bca..2e4a7c6971dc 100644
--- a/drivers/mmc/host/moxart-mmc.c
+++ b/drivers/mmc/host/moxart-mmc.c
@@ -631,6 +631,7 @@ static int moxart_probe(struct platform_device *pdev)
 			 host->dma_chan_tx, host->dma_chan_rx);
 		host->have_dma = true;
 
+		memset(&cfg, 0, sizeof(cfg));
 		cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 		cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 
-- 
2.30.2