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virtio: console: Check if portdev is valid in send_control_msg()

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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 <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2010-09-02 18:11:42 +05:30 committed by Rusty Russell
parent 96eb872b2a
commit 84ec06c59a
1 changed files with 4 additions and 1 deletions
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5
drivers/char/virtio_console.c
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@ -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 */