virtio: console: Make read() return -ENODEV on hot-unplug
When a port is hot-unplugged while an app was blocked on a read() 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 <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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@ -582,6 +582,9 @@ static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
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if (ret < 0)
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return ret;
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}
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/* Port got hot-unplugged. */
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if (!port->guest_connected)
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return -ENODEV;
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/*
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* We could've received a disconnection message while we were
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* waiting for more data.
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