linux-kernel - [PATCH v1] serial: 8250_mtk: fix uart corruption issue when rx power off

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Message-ID: <20210729014817.11879-2-zhiyong.tao@mediatek.com>
Date:   Thu, 29 Jul 2021 09:48:17 +0800
From:   Zhiyong Tao <zhiyong.tao@...iatek.com>
To:     <timur@...nel.org>, <linux@...linux.org.uk>, <alcooperx@...il.com>,
        <tklauser@...tanz.ch>, <sean.wang@...nel.org>
CC:     <srv_heupstream@...iatek.com>, <zhiyong.tao@...iatek.com>,
        <hui.liu@...iatek.com>, <yuchen.huang@...iatek.com>,
        <huihui.wang@...iatek.com>, <eddie.huang@...iatek.com>,
        <sean.wang@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-serial@...r.kernel.org>
Subject: [PATCH v1] serial: 8250_mtk: fix uart corruption issue when rx power off

Fix uart corruption issue when rx power off.
Add spin lock in mtk8250_dma_rx_complete function in APDMA mode.

Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>
---
 drivers/tty/serial/8250/8250_mtk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index f7d3023f860f..fb65dc601b23 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -93,10 +93,13 @@ static void mtk8250_dma_rx_complete(void *param)
 	struct dma_tx_state state;
 	int copied, total, cnt;
 	unsigned char *ptr;
+	unsigned long flags;
 
 	if (data->rx_status == DMA_RX_SHUTDOWN)
 		return;
 
+	spin_lock_irqsave(&up->port.lock, flags);
+
 	dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
 	total = dma->rx_size - state.residue;
 	cnt = total;
@@ -120,6 +123,8 @@ static void mtk8250_dma_rx_complete(void *param)
 	tty_flip_buffer_push(tty_port);
 
 	mtk8250_rx_dma(up);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
 static void mtk8250_rx_dma(struct uart_8250_port *up)
-- 
2.18.0