linux-kernel - [PATCH RESEND 2/2] serial: 8250: omap: Move pm_runtime_get

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Message-ID: <20241011173356.870883-3-jm@ti.com>
Date: Fri, 11 Oct 2024 12:33:56 -0500
From: Judith Mendez <jm@...com>
To: Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman
	<khilman@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz
 Golaszewski <brgl@...ev.pl>
CC: <linux-omap@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Bin Liu <b-liu@...com>,
        <linux-serial@...r.kernel.org>, Judith Mendez <jm@...com>
Subject: [PATCH RESEND 2/2] serial: 8250: omap: Move pm_runtime_get_sync

Currently in omap_8250_shutdown, the dma->rx_running
flag is set to zero in omap_8250_rx_dma_flush. Next
pm_runtime_get_sync is called, which is a runtime
resume call stack which can re-set the flag. When the
call omap_8250_shutdown returns, the flag is expected
to be UN-SET, but this is not the case. This is causing
issues the next time UART is re-opened and omap_8250_rx_dma
is called. Fix by moving pm_runtime_get_sync before the
omap_8250_rx_dma_flush.

Signed-off-by: Bin Liu <b-liu@...com>
Signed-off-by: Judith Mendez <jm@...com>
---
 drivers/tty/serial/8250/8250_omap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 88b58f44e4e9..0dd68bdbfbcf 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -776,12 +776,12 @@ static void omap_8250_shutdown(struct uart_port *port)
 	struct uart_8250_port *up = up_to_u8250p(port);
 	struct omap8250_priv *priv = port->private_data;
 
+	pm_runtime_get_sync(port->dev);
+
 	flush_work(&priv->qos_work);
 	if (up->dma)
 		omap_8250_rx_dma_flush(up);
 
-	pm_runtime_get_sync(port->dev);
-
 	serial_out(up, UART_OMAP_WER, 0);
 	if (priv->habit & UART_HAS_EFR2)
 		serial_out(up, UART_OMAP_EFR2, 0x0);
-- 
2.47.0