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virtio: console: Make read() return -ENODEV on hot-unplug

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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>
This commit is contained in:
Amit Shah 2010-09-02 18:11:45 +05:30 committed by Rusty Russell
parent 8529a50427
commit b3dddb9e6d
1 changed files with 3 additions and 0 deletions
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3
drivers/char/virtio_console.c
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@ -582,6 +582,9 @@ static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
if (ret < 0)
return ret;
}
/* Port got hot-unplugged. */
if (!port->guest_connected)
return -ENODEV;
/*
* We could've received a disconnection message while we were
* waiting for more data.