linux-kernel - [PATCH AUTOSEL for 4.4 048/167] serial: 8250: omap: Disable DMA for console UART

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Date:   Mon, 19 Mar 2018 16:06:21 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Vignesh R <vigneshr@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 048/167] serial: 8250: omap: Disable DMA for
 console UART

From: Vignesh R <vigneshr@...com>

[ Upstream commit 84b40e3b57eef1417479c00490dd4c9f6e5ffdbc ]

Kernel always writes log messages to console via
serial8250_console_write()->serial8250_console_putchar() which directly
accesses UART_TX register _without_ using DMA.

But, if other processes like systemd using same UART port, then these
writes are handled by a different code flow using 8250_omap driver where
there is provision to use DMA.

It seems that it is possible that both DMA and CPU might simultaneously
put data to UART FIFO and lead to potential loss of data due to FIFO
overflow and weird data corruption. This happens when both kernel
console and userspace tries to write simultaneously to the same UART
port. Therefore, disable DMA on kernel console port to avoid potential
race between CPU and DMA.

Signed-off-by: Vignesh R <vigneshr@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/tty/serial/8250/8250_omap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index e8dd296fb25b..c4383573cf66 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -608,6 +608,10 @@ static int omap_8250_startup(struct uart_port *port)
 	up->lsr_saved_flags = 0;
 	up->msr_saved_flags = 0;

+	/* Disable DMA for console UART */
+	if (uart_console(port))
+		up->dma = NULL;
+
 	if (up->dma) {
 		ret = serial8250_request_dma(up);
 		if (ret) {
-- 
2.14.1