Unbinding the bcm2835aux UART driver raises the following error if the
maximum number of 8250 UARTs is set to 1 (via the 8250.nr_uarts module
parameter or CONFIG_SERIAL_8250_RUNTIME_UARTS):
(NULL device *): Removing wrong port: a6f80333 != fa20408b
That's because bcm2835aux_serial_probe() retrieves UART line number 1
from the devicetree and stores it in data->uart.port.line, while
serial8250_register_8250_port() instead uses UART line number 0,
which is stored in data->line.
On driver unbind, bcm2835aux_serial_remove() uses data->uart.port.line,
which contains the wrong number. Fix it.
The issue does not occur if the maximum number of 8250 UARTs is >= 2.
Fixes: bdc5f3009580 ("serial: bcm2835: add driver for bcm2835-aux-uart")
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.6+
Cc: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_bcm2835aux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
index 8ce700c1a7fc..4997c519ebb3 100644
--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -113,7 +113,7 @@ static int bcm2835aux_serial_remove(struct platform_device *pdev)
{
struct bcm2835aux_data *data = platform_get_drvdata(pdev);
- serial8250_unregister_port(data->uart.port.line);
+ serial8250_unregister_port(data->line);
clk_disable_unprepare(data->clk);
return 0;
--
2.24.0
