[PATCH v4 05/10] serial: sh-sci: Remove timer on shutdown of port

[Geert Uytterhoeven <geert+renesas@glider.be>]

From: Aleksandar Mitev <amitev@visteon.com>

This prevents DMA timer timeout that can trigger after the port has
been closed.

Signed-off-by: Aleksandar Mitev <amitev@visteon.com>
[geert: Move del_timer_sync() outside spinlock to avoid circular locking
        dependency between rx_timer_fn() and del_timer_sync()]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v4:
  - New.
---
 drivers/tty/serial/sh-sci.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index ac9ce8f1ff799a48..36a11110acf4cab5 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1810,6 +1810,14 @@ static void sci_shutdown(struct uart_port *port)
 	sci_stop_tx(port);
 	spin_unlock_irqrestore(&port->lock, flags);
 
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+	if (s->chan_rx) {
+		dev_dbg(port->dev, "%s(%d) deleting rx_timer\n", __func__,
+			port->line);
+		del_timer_sync(&s->rx_timer);
+	}
+#endif
+
 	sci_free_dma(port);
 	sci_free_irq(s);
 }
-- 
1.9.1