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authorMichael S. Tsirkin <mst@redhat.com>2013-06-06 15:20:39 +0300
committerDavid S. Miller <davem@davemloft.net>2013-06-11 02:46:21 -0700
commit05c05351943cc03bf5c77e86953b24ae6fb21368 (patch)
tree51274c86eeca2cd5040979d1fdebd81fe0518a19 /drivers/vhost/vhost.c
parentc2020be3c35ab230b4ee046c262ddab3e0d3aab4 (diff)
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 <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/vhost/vhost.c')
-rw-r--r--drivers/vhost/vhost.c8
1 files changed, 7 insertions, 1 deletions
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
@@ -344,13 +344,19 @@ static int vhost_attach_cgroups(struct vhost_dev *dev)
}
/* 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)
{
struct task_struct *worker;
int err;
/* Is there an owner already? */
- if (dev->mm) {
+ if (vhost_dev_has_owner(dev)) {
err = -EBUSY;
goto err_mm;
}