Input: i8042 - set up shared ps2_cmd_mutex for AUX ports

[ Upstream commit 47af45d ]

The commit 4097461 ("Input: i8042 - break load dependency ...")
correctly set up ps2_cmd_mutex pointer for the KBD port but forgot to do
the same for AUX port(s), which results in communication on KBD and AUX
ports to clash with each other.

Fixes: 4097461 ("Input: i8042 - break load dependency ...")
Reported-by: Bruno Wolff III <[email protected]>
Tested-by: Bruno Wolff III <[email protected]>
Cc: [email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

drivers/input/serio/i8042.c

@@ -1258,6 +1258,7 @@ static int __init i8042_create_aux_port(int idx)
 	serio->write		= i8042_aux_write;
 	serio->start		= i8042_start;
 	serio->stop		= i8042_stop;
+	serio->ps2_cmd_mutex	= &i8042_mutex;
 	serio->port_data	= port;
 	serio->dev.parent	= &i8042_platform_device->dev;
 	if (idx < 0) {