[PATCH 5.4 161/168] Revert "serial: uartps: Do not allow use aliases >= MAX_UART_INSTANCES"

From: Greg Kroah-Hartman
Date: Tue Apr 28 2020 - 14:44:34 EST


From: Michal Simek <michal.simek@xxxxxxxxxx>

commit 91c9dfa25c7f95b543c280e0edf1fd8de6e90985 upstream.

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@xxxxxxxxxx>
Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/dac3898e3e32d963f357fb436ac9a7ac3cbcf933.1585905873.git.michal.simek@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1697,8 +1697,7 @@ err_out_unregister_driver:
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;
}
@@ -1723,8 +1722,7 @@ static int cdns_uart_remove(struct platf
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);