diff options
| author | Gao feng <omarapazanadi@gmail.com> | 2016-12-14 14:24:36 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-12-16 01:12:49 +0300 |
| commit | 6c083c2b8a0a110cad936bc0a2c089f0d8115175 (patch) | |
| tree | 2410b49fbd4cdf62937e2045a1e4e0c97a74daa0 /drivers/vhost | |
| parent | a3cbec69727c8c149ee2b3652e184818cc269fe6 (diff) | |
| download | linux-6c083c2b8a0a110cad936bc0a2c089f0d8115175.tar.xz | |
vsock: lookup and setup guest_cid inside vhost_vsock_lock
Multi vsocks may setup the same cid at the same time.
Signed-off-by: Gao feng <omarapazanadi@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vsock.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index e6b70966c19d..bbbf588540ed 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -50,11 +50,10 @@ static u32 vhost_transport_get_local_cid(void) return VHOST_VSOCK_DEFAULT_HOST_CID; } -static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) +static struct vhost_vsock *__vhost_vsock_get(u32 guest_cid) { struct vhost_vsock *vsock; - spin_lock_bh(&vhost_vsock_lock); list_for_each_entry(vsock, &vhost_vsock_list, list) { u32 other_cid = vsock->guest_cid; @@ -63,15 +62,24 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) continue; if (other_cid == guest_cid) { - spin_unlock_bh(&vhost_vsock_lock); return vsock; } } - spin_unlock_bh(&vhost_vsock_lock); return NULL; } +static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) +{ + struct vhost_vsock *vsock; + + spin_lock_bh(&vhost_vsock_lock); + vsock = __vhost_vsock_get(guest_cid); + spin_unlock_bh(&vhost_vsock_lock); + + return vsock; +} + static void vhost_transport_do_send_pkt(struct vhost_vsock *vsock, struct vhost_virtqueue *vq) @@ -559,11 +567,12 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) return -EINVAL; /* Refuse if CID is already in use */ - other = vhost_vsock_get(guest_cid); - if (other && other != vsock) - return -EADDRINUSE; - spin_lock_bh(&vhost_vsock_lock); + other = __vhost_vsock_get(guest_cid); + if (other && other != vsock) { + spin_unlock_bh(&vhost_vsock_lock); + return -EADDRINUSE; + } vsock->guest_cid = guest_cid; spin_unlock_bh(&vhost_vsock_lock); |