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authorMichael S. Tsirkin <mst@redhat.com>2011-11-27 19:05:58 +0200
committerMichael S. Tsirkin <mst@redhat.com>2012-02-28 09:13:22 +0200
commitea5d404655ba3b356d0c06d6a3c4f24112124522 (patch)
tree092a40fd222d3565ca4b5188c85dba65c1305583 /drivers/vhost
parentd550dda192c1bd039afb774b99485e88b70d7cb8 (diff)
downloadlinux-linaro-stable-ea5d404655ba3b356d0c06d6a3c4f24112124522.tar.gz
vhost: fix release path lockdep checks
We shouldn't hold any locks on release path. Pass a flag to vhost_dev_cleanup to use the lockdep info correctly. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Sasha Levin <levinsasha928@gmail.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/net.c2
-rw-r--r--drivers/vhost/vhost.c9
-rw-r--r--drivers/vhost/vhost.h2
3 files changed, 7 insertions, 6 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 9dab1f51dd43..f0da2c32fbde 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -588,7 +588,7 @@ static int vhost_net_release(struct inode *inode, struct file *f)
vhost_net_stop(n, &tx_sock, &rx_sock);
vhost_net_flush(n);
- vhost_dev_cleanup(&n->dev);
+ vhost_dev_cleanup(&n->dev, false);
if (tx_sock)
fput(tx_sock->file);
if (rx_sock)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index ae66278e4dcf..385d8ee0d2d1 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -405,7 +405,7 @@ long vhost_dev_reset_owner(struct vhost_dev *dev)
if (!memory)
return -ENOMEM;
- vhost_dev_cleanup(dev);
+ vhost_dev_cleanup(dev, true);
memory->nregions = 0;
RCU_INIT_POINTER(dev->memory, memory);
@@ -436,8 +436,8 @@ int vhost_zerocopy_signal_used(struct vhost_virtqueue *vq)
return j;
}
-/* Caller should have device mutex */
-void vhost_dev_cleanup(struct vhost_dev *dev)
+/* Caller should have device mutex if and only if locked is set */
+void vhost_dev_cleanup(struct vhost_dev *dev, bool locked)
{
int i;
@@ -474,7 +474,8 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
dev->log_file = NULL;
/* No one will access memory at this point */
kfree(rcu_dereference_protected(dev->memory,
- lockdep_is_held(&dev->mutex)));
+ locked ==
+ lockdep_is_held(&dev->mutex)));
RCU_INIT_POINTER(dev->memory, NULL);
WARN_ON(!list_empty(&dev->work_list));
if (dev->worker) {
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index a801e2821d03..8dcf4cca6bf2 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -163,7 +163,7 @@ struct vhost_dev {
long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue *vqs, int nvqs);
long vhost_dev_check_owner(struct vhost_dev *);
long vhost_dev_reset_owner(struct vhost_dev *);
-void vhost_dev_cleanup(struct vhost_dev *);
+void vhost_dev_cleanup(struct vhost_dev *, bool locked);
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, unsigned long arg);
int vhost_vq_access_ok(struct vhost_virtqueue *vq);
int vhost_log_access_ok(struct vhost_dev *);