From: Tony Lindgren tony@atomide.com
stable inclusion from stable-5.10.65 commit 10d3bdd2d57867a98473a0a4bc153262e9b902b9 bugzilla: 182361 https://gitee.com/openeuler/kernel/issues/I4EH3U
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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 Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/spi/spi-pic32.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/spi/spi-pic32.c b/drivers/spi/spi-pic32.c index 104bde153efd..5eb7b61bbb4d 100644 --- a/drivers/spi/spi-pic32.c +++ b/drivers/spi/spi-pic32.c @@ -361,6 +361,7 @@ 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;