[PATCH 1/4] tcm_vhost: Add missed lock in vhost_scsi_clear_endpoint()

[Asias He <asias@redhat.com>]

tv_tpg->tv_tpg_vhost_count should be protected by tv_tpg->tv_tpg_mutex.

Signed-off-by: Asias He <asias@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 drivers/vhost/tcm_vhost.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 9951297..b3e50d7 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -860,9 +860,11 @@ static int vhost_scsi_clear_endpoint(
 		if (!tv_tpg)
 			continue;
 
+		mutex_lock(&tv_tpg->tv_tpg_mutex);
 		tv_tport = tv_tpg->tport;
 		if (!tv_tport) {
 			ret = -ENODEV;
+			mutex_unlock(&tv_tpg->tv_tpg_mutex);
 			goto err;
 		}
 
@@ -872,11 +874,13 @@ static int vhost_scsi_clear_endpoint(
 				tv_tport->tport_name, tv_tpg->tport_tpgt,
 				t->vhost_wwpn, t->vhost_tpgt);
 			ret = -EINVAL;
+			mutex_unlock(&tv_tpg->tv_tpg_mutex);
 			goto err;
 		}
 		tv_tpg->tv_tpg_vhost_count--;
 		vs->vs_tpg[target] = NULL;
 		vs->vs_endpoint = false;
+		mutex_unlock(&tv_tpg->tv_tpg_mutex);
 	}
 	mutex_unlock(&vs->dev.mutex);
 	return 0;
-- 
1.8.1.4