tty: serial: fsl_lpuart: Drop unnecessary lpuart*_stop_tx()

By the time lpuart_shutdown() calls lpuart_stop_tx() UARTCR2_TE and
UARTCR2_TIE (which the latter will clear) are already cleared, so that
function call should effectively be a no-op. Moreso, lpuart_stop_tx()
is expected to be executed with port spinlock held, which the caller
doesn't. Given all that, drop the call to lpuart_stop_tx() in
lpuart_shutdown().

In case of lpuart32_shutdown()/lpuart32_stop_tx(), TIE won't even be
set if lpuart_dma_tx_use is true. Drop it there as well.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-imx@nxp.com
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/20190729195226.8862-18-andrew.smirnov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index e59dd90fc34c08dcbf55e2876bee7d2e3eb0d72e..2597a877d639a00727b99204a44aad95aeaf800d 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1574,8 +1574,6 @@ static void lpuart_shutdown(struct uart_port *port)
                        sport->dma_tx_in_progress = false;
                        dmaengine_terminate_all(sport->dma_tx_chan);
                }
-
-               lpuart_stop_tx(port);
        }
 }
 
@@ -1607,8 +1605,6 @@ static void lpuart32_shutdown(struct uart_port *port)
                        sport->dma_tx_in_progress = false;
                        dmaengine_terminate_all(sport->dma_tx_chan);
                }
-
-               lpuart32_stop_tx(port);
        }
 }