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Subject[PATCH] serial: core: Don't drop port_mutex in serial_core_remove_one_port
Date
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>
---
drivers/tty/serial/serial_core.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 29bd5ede0b25..efda90215ee9 100644
--- 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);
}

/**
--
2.39.2
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