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vhost/vsock: switch to a mutex for vhost_vsock_hash 

Now that there are no more data path users of vhost_vsock_lock, it can
be turned into a mutex.  It's only used by .release() and in the
.ioctl() path.

Depends-on: <20181105103547.22018-1-stefanha@redhat.com>
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-11-05 17:33:22 +00:00 committed by Michael S. Tsirkin
parent 1f23816b8e
commit 6db3d8dc5d
1 changed files with 8 additions and 8 deletions
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16
drivers/vhost/vsock.c
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@ -27,14 +27,14 @@ enum {
};
/* Used to track all the vhost_vsock instances on the system. */
static DEFINE_SPINLOCK(vhost_vsock_lock);
static DEFINE_MUTEX(vhost_vsock_mutex);
static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8);
struct vhost_vsock {
struct vhost_dev dev;
struct vhost_virtqueue vqs[2];
/* Link to global vhost_vsock_hash, writes use vhost_vsock_lock */
/* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */
struct hlist_node hash;
struct vhost_work send_pkt_work;
@ -51,7 +51,7 @@ static u32 vhost_transport_get_local_cid(void)
return VHOST_VSOCK_DEFAULT_HOST_CID;
}
/* Callers that dereference the return value must hold vhost_vsock_lock or the
/* Callers that dereference the return value must hold vhost_vsock_mutex or the
* RCU read lock.
*/
static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
@ -584,10 +584,10 @@ static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
{
struct vhost_vsock *vsock = file->private_data;
spin_lock_bh(&vhost_vsock_lock);
mutex_lock(&vhost_vsock_mutex);
if (vsock->guest_cid)
hash_del_rcu(&vsock->hash);
spin_unlock_bh(&vhost_vsock_lock);
mutex_unlock(&vhost_vsock_mutex);
/* Wait for other CPUs to finish using vsock */
synchronize_rcu();
@ -631,10 +631,10 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
return -EINVAL;
/* Refuse if CID is already in use */
spin_lock_bh(&vhost_vsock_lock);
mutex_lock(&vhost_vsock_mutex);
other = vhost_vsock_get(guest_cid);
if (other && other != vsock) {
spin_unlock_bh(&vhost_vsock_lock);
mutex_unlock(&vhost_vsock_mutex);
return -EADDRINUSE;
}
@ -643,7 +643,7 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
vsock->guest_cid = guest_cid;
hash_add_rcu(vhost_vsock_hash, &vsock->hash, guest_cid);
spin_unlock_bh(&vhost_vsock_lock);
mutex_unlock(&vhost_vsock_mutex);
return 0;
}