serial: sunhv: Initialize lock for non-registered console

The commit a3cb39d258ef
("serial: core: Allow detach and attach serial device for console")
changed a bit logic behind lock initialization since for most of the console
driver it's supposed to have lock already initialized even if console is not
enabled. However, it's not the case for Sparc HV console.

Initialize lock explicitly in the ->probe().

Note, there is still an open question should or shouldn't not this driver
register console properly.

Fixes: a3cb39d258ef ("serial: core: Allow detach and attach serial device for console")
Reported-by: Anatoly Pugachev <matorola@gmail.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Anatoly Pugachev <matorola@gmail.com>
Link: https://lore.kernel.org/r/20200402172026.79478-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
index eafada8fb6fad8755104ffa4fdc7cb40c8cc1d6e..e35073e93a5b4710a56039a3e36ed15a00dc9b90 100644 (file)
--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -567,6 +567,9 @@ static int hv_probe(struct platform_device *op)
        sunserial_console_match(&sunhv_console, op->dev.of_node,
                                &sunhv_reg, port->line, false);
 
+       /* We need to initialize lock even for non-registered console */
+       spin_lock_init(&port->lock);
+
        err = uart_add_one_port(&sunhv_reg, port);
        if (err)
                goto out_unregister_driver;