From: Tony Lindgren tony@atomide.com
stable inclusion from linux-4.19.207 commit 8dedc73c5edbcf909434783f5195beec3fe85bec
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[ Upstream commit c3ff0189d3bc9c03845fe37472c140f0fefd0c79 ]
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 dw_mmc, this is probably not currently an issue but is still good to fix though.
Fixes: 3fc7eaef44db ("mmc: dw_mmc: Add external dma interface support") Cc: Shawn Lin shawn.lin@rock-chips.com Cc: Jaehoon Chung jh80.chung@samsung.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/20210810081644.19353-2-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/dw_mmc.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 8e09586f880f1..e3991df078efb 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -808,6 +808,7 @@ static int dw_mci_edmac_start_dma(struct dw_mci *host, int ret = 0;
/* Set external dma config: burst size, burst width */ + memset(&cfg, 0, sizeof(cfg)); cfg.dst_addr = host->phy_regs + fifo_offset; cfg.src_addr = cfg.dst_addr; cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;