]> git.itanic.dy.fi Git - linux-stable/commit
serial: 8250_bcm2835aux: Fix line mismatch on driver unbind
authorLukas Wunner <lukas@wunner.de>
Thu, 16 Jan 2020 12:14:01 +0000 (13:14 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 1 Feb 2020 09:32:53 +0000 (09:32 +0000)
commit8df95580526cf8334646e2d95332256fa7067ce6
tree7f96f81d8671be605a255a5795a07a8eb01e28cf
parentc55cf7ea572b4377e84621bcd5f4469ba7f003ce
serial: 8250_bcm2835aux: Fix line mismatch on driver unbind

commit dc76697d7e933d5e299116f219c890568785ea15 upstream.

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@wunner.de>
Cc: stable@vger.kernel.org # v4.6+
Cc: Martin Sperl <kernel@martin.sperl.org>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/912ccf553c5258135c6d7e8f404a101ef320f0f4.1579175223.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/8250/8250_bcm2835aux.c