linux-kernel - [PATCH 5.6 158/167] Revert "serial: uartps: Use the same dynamic major number for all ports"

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Date:   Tue, 28 Apr 2020 20:25:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
Subject: [PATCH 5.6 158/167] Revert "serial: uartps: Use the same dynamic major number for all ports"

From: Michal Simek <michal.simek@...inx.com>

commit 8da1a3940da4b0e82848ec29b835486890bc9232 upstream.

This reverts commit ab262666018de6f4e206b021386b93ed0c164316.

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@...nel.org>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/14a565fc1e14a5ec6cc6a6710deb878ae8305f22.1585905873.git.michal.simek@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/xilinx_uartps.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -26,13 +26,13 @@
 
 #define CDNS_UART_TTY_NAME	"ttyPS"
 #define CDNS_UART_NAME		"xuartps"
+#define CDNS_UART_MAJOR		0	/* use dynamic node allocation */
 #define CDNS_UART_FIFO_SIZE	64	/* FIFO size */
 #define CDNS_UART_REGISTER_SPACE	0x1000
 #define TX_TIMEOUT		500000
 
 /* Rx Trigger level */
 static int rx_trigger_level = 56;
-static int uartps_major;
 module_param(rx_trigger_level, uint, 0444);
 MODULE_PARM_DESC(rx_trigger_level, "Rx trigger level, 1-63 bytes");
 
@@ -1547,7 +1547,7 @@ static int cdns_uart_probe(struct platfo
 	cdns_uart_uart_driver->owner = THIS_MODULE;
 	cdns_uart_uart_driver->driver_name = driver_name;
 	cdns_uart_uart_driver->dev_name	= CDNS_UART_TTY_NAME;
-	cdns_uart_uart_driver->major = uartps_major;
+	cdns_uart_uart_driver->major = CDNS_UART_MAJOR;
 	cdns_uart_uart_driver->minor = cdns_uart_data->id;
 	cdns_uart_uart_driver->nr = 1;
 
@@ -1576,7 +1576,6 @@ static int cdns_uart_probe(struct platfo
 		goto err_out_id;
 	}
 
-	uartps_major = cdns_uart_uart_driver->tty_driver->major;
 	cdns_uart_data->cdns_uart_driver = cdns_uart_uart_driver;
 
 	/*