From: Amit Shah <amit.shah@redhat.com>
Date: Thu, 2 Sep 2010 12:41:44 +0000 (+0530)
Subject: virtio: console: Unblock poll on port hot-unplug
X-Git-Tag: v2.6.37-rc1~219^2~14
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8529a504273d4efa6bb004dcd6ef28fe67b64ae9;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

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>
---

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 92f1f65..47b710c 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -663,6 +663,10 @@ static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
 	port = filp->private_data;
 	poll_wait(filp, &port->waitqueue, wait);
 
+	if (!port->guest_connected) {
+		/* Port got unplugged */
+		return POLLHUP;
+	}
 	ret = 0;
 	if (!will_read_block(port))
 		ret |= POLLIN | POLLRDNORM;