linux-kernel - [PATCH 4.19 050/205] serial: sh-sci: Fix could not remove dev_attr_rx_fifo

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Date:   Mon, 19 Nov 2018 17:25:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@...esas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Ulrich Hecht <uli+renesas@...nd.eu>
Subject: [PATCH 4.19 050/205] serial: sh-sci: Fix could not remove dev_attr_rx_fifo_timeout

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit 641a41dbba217ee5bd26abe6be77f8cead9cd00e upstream.

This patch fixes an issue that the sci_remove() could not remove
dev_attr_rx_fifo_timeout because uart_remove_one_port() set
the port->port.type to PORT_UNKNOWN.

Reported-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@...esas.com>
Fixes: 5d23188a473d ("serial: sh-sci: make RX FIFO parameters tunable via sysfs")
Cc: <stable@...r.kernel.org> # v4.11+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Ulrich Hecht <uli+renesas@...nd.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/sh-sci.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -3102,6 +3102,7 @@ static struct uart_driver sci_uart_drive
 static int sci_remove(struct platform_device *dev)
 {
 	struct sci_port *port = platform_get_drvdata(dev);
+	unsigned int type = port->port.type;	/* uart_remove_... clears it */
 
 	sci_ports_in_use &= ~BIT(port->port.line);
 	uart_remove_one_port(&sci_uart_driver, &port->port);
@@ -3112,8 +3113,7 @@ static int sci_remove(struct platform_de
 		sysfs_remove_file(&dev->dev.kobj,
 				  &dev_attr_rx_fifo_trigger.attr);
 	}
-	if (port->port.type == PORT_SCIFA || port->port.type == PORT_SCIFB ||
-	    port->port.type == PORT_HSCIF) {
+	if (type == PORT_SCIFA || type == PORT_SCIFB || type == PORT_HSCIF) {
 		sysfs_remove_file(&dev->dev.kobj,
 				  &dev_attr_rx_fifo_timeout.attr);
 	}