Subject: virtio: console: Make write() return -ENODEV on hot-unplug Date: Thu, 2 Sep 2010 18:11:46 +0530 From: Amit Shah When a port is hot-unplugged while an app was blocked on a write() call, the call was unblocked but would not get an error returned. Return -ENODEV to ensure the app knows the port has gone away. Signed-off-by: Amit Shah Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 7fa3c26..ecadfa2 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -619,6 +619,9 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, if (ret < 0) return ret; } + /* Port got hot-unplugged. */ + if (!port->guest_connected) + return -ENODEV; count = min((size_t)(32 * 1024), count);