linux-kernel - [PATCH 4/7] Revert "serial: uartps: Do not allow use aliases >= MAX_UART

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Date:   Fri,  3 Apr 2020 11:24:33 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     johan@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com
Cc:     Jiri Slaby <jslaby@...e.com>, linux-arm-kernel@...ts.infradead.org,
        linux-serial@...r.kernel.org
Subject: [PATCH 4/7] Revert "serial: uartps: Do not allow use aliases >= MAX_UART_INSTANCES"

This reverts commit 2088cfd882d0403609bdf426e9b24372fe1b8337.

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>
---

 drivers/tty/serial/xilinx_uartps.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 412bfc51f546..9db3cd120057 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1712,8 +1712,7 @@ static int cdns_uart_probe(struct platform_device *pdev)
 	uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
 err_out_id:
 	mutex_lock(&bitmap_lock);
-	if (cdns_uart_data->id < MAX_UART_INSTANCES)
-		clear_bit(cdns_uart_data->id, bitmap);
+	clear_bit(cdns_uart_data->id, bitmap);
 	mutex_unlock(&bitmap_lock);
 	return rc;
 }
@@ -1738,8 +1737,7 @@ static int cdns_uart_remove(struct platform_device *pdev)
 	rc = uart_remove_one_port(cdns_uart_data->cdns_uart_driver, port);
 	port->mapbase = 0;
 	mutex_lock(&bitmap_lock);
-	if (cdns_uart_data->id < MAX_UART_INSTANCES)
-		clear_bit(cdns_uart_data->id, bitmap);
+	clear_bit(cdns_uart_data->id, bitmap);
 	mutex_unlock(&bitmap_lock);
 	clk_disable_unprepare(cdns_uart_data->uartclk);
 	clk_disable_unprepare(cdns_uart_data->pclk);
-- 
2.26.0