release/5.2.43/Revert-serial-uartps-Move-Port-ID-to-device-data-str.patch

From ba2944c2060ae8769797b5cb841f3f37359e2baa Mon Sep 17 00:00:00 2001
From: Michal Simek <michal.simek@xilinx.com>
Date: Fri, 3 Apr 2020 11:24:35 +0200
Subject: [PATCH] Revert "serial: uartps: Move Port ID to device data
 structure"

commit 492cc08bc16c44e2e587362ada3f6269dee2be22 upstream.

This reverts commit bed25ac0e2b6ab8f9aed2d20bc9c3a2037311800.

As Johan says, this driver needs a lot more work and these changes are
only going in the wrong direction:
  https://lkml.kernel.org/r/20190523091839.GC568@localhost

Reported-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/eb0ec98fecdca9b79c1a3ac0c30c668b6973b193.1585905873.git.michal.simek@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 4598570725fc..611dc34f9286 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -181,7 +181,6 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
  * @pclk:		APB clock
  * @cdns_uart_driver:	Pointer to UART driver
  * @baud:		Current baud rate
- * @id:			Port ID
  * @clk_rate_change_nb:	Notifier block for clock changes
  * @quirks:		Flags for RXBS support.
  */
@@ -191,7 +190,6 @@ struct cdns_uart {
 	struct clk		*pclk;
 	struct uart_driver	*cdns_uart_driver;
 	unsigned int		baud;
-	int			id;
 	struct notifier_block	clk_rate_change_nb;
 	u32			quirks;
 	bool cts_override;
@@ -1394,7 +1392,7 @@ MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
  */
 static int cdns_uart_probe(struct platform_device *pdev)
 {
-	int rc, irq;
+	int rc, id, irq;
 	struct uart_port *port;
 	struct resource *res;
 	struct cdns_uart *cdns_uart_data;
@@ -1420,18 +1418,18 @@ static int cdns_uart_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* Look for a serialN alias */
-	cdns_uart_data->id = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (cdns_uart_data->id < 0)
-		cdns_uart_data->id = 0;
+	id = of_alias_get_id(pdev->dev.of_node, "serial");
+	if (id < 0)
+		id = 0;
 
-	if (cdns_uart_data->id >= CDNS_UART_NR_PORTS) {
+	if (id >= CDNS_UART_NR_PORTS) {
 		dev_err(&pdev->dev, "Cannot get uart_port structure\n");
 		return -ENODEV;
 	}
 
 	/* There is a need to use unique driver name */
 	driver_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s%d",
-				     CDNS_UART_NAME, cdns_uart_data->id);
+				     CDNS_UART_NAME, id);
 	if (!driver_name)
 		return -ENOMEM;
 
@@ -1439,7 +1437,7 @@ static int cdns_uart_probe(struct platform_device *pdev)
 	cdns_uart_uart_driver->driver_name = driver_name;
 	cdns_uart_uart_driver->dev_name	= CDNS_UART_TTY_NAME;
 	cdns_uart_uart_driver->major = CDNS_UART_MAJOR;
-	cdns_uart_uart_driver->minor = cdns_uart_data->id;
+	cdns_uart_uart_driver->minor = id;
 	cdns_uart_uart_driver->nr = 1;
 
 #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
@@ -1450,7 +1448,7 @@ static int cdns_uart_probe(struct platform_device *pdev)
 
 	strncpy(cdns_uart_console->name, CDNS_UART_TTY_NAME,
 		sizeof(cdns_uart_console->name));
-	cdns_uart_console->index = cdns_uart_data->id;
+	cdns_uart_console->index = id;
 	cdns_uart_console->write = cdns_uart_console_write;
 	cdns_uart_console->device = uart_console_device;
 	cdns_uart_console->setup = cdns_uart_console_setup;
@@ -1472,7 +1470,7 @@ static int cdns_uart_probe(struct platform_device *pdev)
 	 * registration because tty_driver structure is not filled.
 	 * name_base is 0 by default.
 	 */
-	cdns_uart_uart_driver->tty_driver->name_base = cdns_uart_data->id;
+	cdns_uart_uart_driver->tty_driver->name_base = id;
 
 	match = of_match_node(cdns_uart_of_match, pdev->dev.of_node);
 	if (match && match->data) {
-- 
2.7.4