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| author | Amit Shah <amit.shah@redhat.com> | 2010-09-02 18:11:42 +0530 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-10-21 17:44:00 +1030 |
| commit | 84ec06c59a14d0941dd58ca6793b24a7e86b3b85 (patch) | |
| tree | d026b868f47f335e70ddb13575393de125dcd3be | |
| parent | 96eb872b2a041b1536ccc6ae2fa87eb28f6e2bb2 (diff) | |
| download | linux-3.10-84ec06c59a14d0941dd58ca6793b24a7e86b3b85.tar.gz linux-3.10-84ec06c59a14d0941dd58ca6793b24a7e86b3b85.tar.bz2 linux-3.10-84ec06c59a14d0941dd58ca6793b24a7e86b3b85.zip | |
virtio: console: Check if portdev is valid in send_control_msg()
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>
| -rw-r--r-- | 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 e15dbe72edb..e1d382b1553 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 */ |