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virtio: console: Unblock poll on port hot-unplug 

When a port is hot-unplugged while an app is blocked on poll(), unblock
the poll() and return.

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 18:11:44 +05:30 committed by Rusty Russell
parent 3709ea7ae7
commit 8529a50427
1 changed files with 4 additions and 0 deletions
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4
drivers/char/virtio_console.c
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@ -663,6 +663,10 @@ static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
port = filp->private_data; port = filp->private_data;
poll_wait(filp, &port->waitqueue, wait); poll_wait(filp, &port->waitqueue, wait);
if (!port->guest_connected) {
/* Port got unplugged */
return POLLHUP;
}
ret = 0; ret = 0;
if (!will_read_block(port)) if (!will_read_block(port))
ret |= POLLIN | POLLRDNORM; ret |= POLLIN | POLLRDNORM;