From 05c05351943cc03bf5c77e86953b24ae6fb21368 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Thu, 6 Jun 2013 15:20:39 +0300 Subject: vhost: check owner before we overwrite ubuf_info If device has an owner, we shouldn't touch ubuf_info since it might be in use. Signed-off-by: Michael S. Tsirkin Signed-off-by: David S. Miller --- drivers/vhost/vhost.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers/vhost/vhost.c') diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index beee7f5787e6..60aa5ad09a2f 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -343,6 +343,12 @@ static int vhost_attach_cgroups(struct vhost_dev *dev) return attach.ret; } +/* Caller should have device mutex */ +bool vhost_dev_has_owner(struct vhost_dev *dev) +{ + return dev->mm; +} + /* Caller should have device mutex */ long vhost_dev_set_owner(struct vhost_dev *dev) { @@ -350,7 +356,7 @@ long vhost_dev_set_owner(struct vhost_dev *dev) int err; /* Is there an owner already? */ - if (dev->mm) { + if (vhost_dev_has_owner(dev)) { err = -EBUSY; goto err_mm; } -- cgit v1.2.3