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

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 <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2010-09-02 18:11:46 +05:30 committed by Rusty Russell
parent b3dddb9e6d
commit f402811971
1 changed files with 3 additions and 0 deletions
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3
drivers/char/virtio_console.c
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@ -626,6 +626,9 @@ 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);