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serial: sh-sci: Stop RX FIFO timer during port shutdown

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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: 039403765e ("serial: sh-sci: SCIFA/B RX FIFO software timeout")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2018-07-06 11:08:36 +02:00 committed by Greg Kroah-Hartman
parent 16ecf49c10
commit c5a9262fa8
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/sh-sci.c
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@ -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);
}