[PATCH 07/14] virtio: console: Make write() return -ENODEV on hot-unplug

Amit Shah
Thu, 02 Sep 2010 12:41:46 -0000

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 at redhat.com>
---
 drivers/char/virtio_console.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 7fa3c26..ecadfa2 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -619,6 +619,9 @@ 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);

--
1.7.2.2