From: Tony Lindgren tony@atomide.com
stable inclusion from linux-4.19.207 commit a3349b3a4ca50b2821de2291657961fb43bef4d2
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[ 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@gmail.com Cc: Vinod Koul vkoul@kernel.org Cc: Peter Ujfalusi peter.ujfalusi@gmail.com Signed-off-by: Tony Lindgren tony@atomide.com Link: https://lore.kernel.org/r/20210810081644.19353-3-tony@atomide.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- 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 a0670e9cd0127..5553a5643f405 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;