From: Amit Shah Date: Thu, 2 Sep 2010 12:41:45 +0000 (+0530) Subject: virtio: console: Make read() return -ENODEV on hot-unplug X-Git-Tag: v3.12-rc1~8471^2~13 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b3dddb9e6ddab74327f5557c1a6640ea0f56ad1c;p=kernel%2Fkernel-generic.git virtio: console: Make read() return -ENODEV on hot-unplug 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 Signed-off-by: Rusty Russell --- diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 47b710c..e17ecf5 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -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.