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| author | Asias He <asias@redhat.com> | 2013-05-07 14:54:35 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2013-07-11 15:37:28 +0300 |
| commit | e7802212ea4bbbd5db99181942a19ab36ca4b914 (patch) | |
| tree | c532c2ff361c7714595fe6a1ff598a2f79f3657b /drivers/vhost | |
| parent | 2e26af79b7e24e9644a6c16ad4dca61501fb4b3f (diff) | |
| download | linux-e7802212ea4bbbd5db99181942a19ab36ca4b914.tar.gz linux-e7802212ea4bbbd5db99181942a19ab36ca4b914.tar.bz2 linux-e7802212ea4bbbd5db99181942a19ab36ca4b914.zip | |
vhost-scsi: Always access vq->private_data under vq mutex
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/scsi.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 4264840ef7dc..45365396dbbc 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -896,19 +896,15 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) int head, ret; u8 target; + mutex_lock(&vq->mutex); /* * We can handle the vq only after the endpoint is setup by calling the * VHOST_SCSI_SET_ENDPOINT ioctl. - * - * TODO: Check that we are running from vhost_worker which acts - * as read-side critical section for vhost kind of RCU. - * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h */ - vs_tpg = rcu_dereference_check(vq->private_data, 1); + vs_tpg = vq->private_data; if (!vs_tpg) - return; + goto out; - mutex_lock(&vq->mutex); vhost_disable_notify(&vs->dev, vq); for (;;) { @@ -1058,6 +1054,7 @@ err_free: vhost_scsi_free_cmd(cmd); err_cmd: vhost_scsi_send_bad_target(vs, vq, head, out); +out: mutex_unlock(&vq->mutex); } |