linux-kernel - [PATCH 2/2] serial: 8250: 8250_omap.c: Clear DMA RX running status only after DMA termination is done

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Message-ID: <20260112081829.63049-3-m-shah@ti.com>
Date: Mon, 12 Jan 2026 13:48:29 +0530
From: Moteen Shah <m-shah@...com>
To: <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<vigneshr@...com>, <u-kumar1@...com>, <gehariprasath@...com>,
	<g-praveen@...com>, <j-keerthy@...com>, <m-shah@...com>
Subject: [PATCH 2/2] serial: 8250: 8250_omap.c: Clear DMA RX running status only after DMA termination is done

Clear rx_running flag only after DMA teardown polling completes. In the
previous implementation the flag was being cleared while hardware teardown
was still in progress, creating a mismatch between software state
(flag = 0, "ready") and hardware state (still terminating).

Signed-off-by: Moteen Shah <m-shah@...com>
---
 drivers/tty/serial/8250/8250_omap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index e26bae0a6488..272bc07c9a6b 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -931,7 +931,6 @@ static void __dma_rx_do_complete(struct uart_8250_port *p)
 		goto out;
 
 	cookie = dma->rx_cookie;
-	dma->rx_running = 0;
 
 	/* Re-enable RX FIFO interrupt now that transfer is complete */
 	if (priv->habit & UART_HAS_RHR_IT_DIS) {
@@ -965,6 +964,7 @@ static void __dma_rx_do_complete(struct uart_8250_port *p)
 		goto out;
 	ret = tty_insert_flip_string(tty_port, dma->rx_buf, count);
 
+	dma->rx_running = 0;
 	p->port.icount.rx += ret;
 	p->port.icount.buf_overrun += count - ret;
 out:
-- 
2.34.1