A portdev may have been hot-unplugged while a port was open()ed. Skip sending control messages when the portdev isn't valid.
Signed-off-by: Amit Shah <[email protected]> --- drivers/char/virtio_console.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 0f115b4..5cd5374 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -410,7 +410,10 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, static ssize_t send_control_msg(struct port *port, unsigned int event, unsigned int value) { - return __send_control_msg(port->portdev, port->id, event, value); + /* Did the port get unplugged before userspace closed it? */ + if (port->portdev) + return __send_control_msg(port->portdev, port->id, event, value); + return 0; } /* Callers must take the port->outvq_lock */ -- 1.7.2.2 _______________________________________________ Virtualization mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/virtualization
