From 1ce09dea2adae9b20aa16d7c9e113e734ae69111 Mon Sep 17 00:00:00 2001 From: Vignesh Raghavendra Date: Thu, 19 Mar 2020 16:33:39 +0530 Subject: [PATCH] serial: 8250: 8250_omap: Terminate DMA before pushing data on RX timeout [ Upstream commit 7cf4df30a98175033e9849f7f16c46e96ba47f41 ] Terminate and flush DMA internal buffers, before pushing RX data to higher layer. Otherwise, this will lead to data corruption, as driver would end up pushing stale buffer data to higher layer while actual data is still stuck inside DMA hardware and has yet not arrived at the memory. While at that, replace deprecated dmaengine_terminate_all() with dmaengine_terminate_async(). Signed-off-by: Vignesh Raghavendra Link: https://lore.kernel.org/r/20200319110344.21348-2-vigneshr@ti.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/8250/8250_omap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 7d4680ef5307..d41be02abced 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -773,7 +773,10 @@ static void __dma_rx_do_complete(struct uart_8250_port *p) dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); count = dma->rx_size - state.residue; - + if (count < dma->rx_size) + dmaengine_terminate_async(dma->rxchan); + if (!count) + goto unlock; ret = tty_insert_flip_string(tty_port, dma->rx_buf, count); p->port.icount.rx += ret; @@ -811,7 +814,6 @@ static void omap_8250_rx_dma_flush(struct uart_8250_port *p) spin_unlock_irqrestore(&priv->rx_dma_lock, flags); __dma_rx_do_complete(p); - dmaengine_terminate_all(dma->rxchan); } static int omap_8250_rx_dma(struct uart_8250_port *p)