serial: core: Don't drop port_mutex in serial_core_remove_one_port

Commit 84a9582fd203 ("serial: core: Start managing serial controllers to
enable runtime PM") required the caller to hold port_mutex rather than
taking it locally. However the mutex_unlock() call wasn't removed
causing the mutex to be dropped unexpectly. Remove the call to
mutex_unlock() (and fix up the early return) to restore correct
behaviour.

Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM")
Signed-off-by: Steven Price <steven.price@arm.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20230601105548.29965-1-steven.price@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 29bd5ede0b254c010cf3705e932f2f1877f7d0ec..efda90215ee9b6852a37cc689cb0153f1a248867 100644 (file)
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3194,7 +3194,7 @@ static void serial_core_remove_one_port(struct uart_driver *drv,
 
        if (!uart_port) {
                mutex_unlock(&port->mutex);
-               goto out;
+               return;
        }
        mutex_unlock(&port->mutex);
 
@@ -3234,8 +3234,6 @@ static void serial_core_remove_one_port(struct uart_driver *drv,
        wait_event(state->remove_wait, !atomic_read(&state->refcount));
        state->uart_port = NULL;
        mutex_unlock(&port->mutex);
-out:
-       mutex_unlock(&port_mutex);
 }
 
 /**