linux-kernel - [PATCH AUTOSEL 4.18 015/136] serial: sh-sci: Stop RX FIFO timer during port shutdown

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Message-ID: <20180917030006.245495-15-alexander.levin@microsoft.com>
Date:   Mon, 17 Sep 2018 03:00:20 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 015/136] serial: sh-sci: Stop RX FIFO timer
 during port shutdown

From: Geert Uytterhoeven <geert+renesas@...der.be>

[ Upstream commit c5a9262fa8bfed0dddc7466ef10fcd292e2af61b ]

The RX FIFO timer may be armed when the port is shut down, hence the
timer function may still be called afterwards.

Fix this race condition by deleting the timer during port shutdown.

Fixes: 039403765e5da3c6 ("serial: sh-sci: SCIFA/B RX FIFO software timeout")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/tty/serial/sh-sci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index c181eb37f985..3c55600a8236 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2099,6 +2099,8 @@ static void sci_shutdown(struct uart_port *port)
 	}
 #endif
 
+	if (s->rx_trigger > 1 && s->rx_fifo_timeout > 0)
+		del_timer_sync(&s->rx_fifo_timer);
 	sci_free_irq(s);
 	sci_free_dma(port);
 }
-- 
2.17.1