[RFC PATCH 6/8] vhost-scsi: Add callback to stop and wait on works

[Mike Christie]

This moves the scsi code we use to stop new works from being queued
and wait on running works to a helper which is used by the vhost layer
when the vhost_task is being killed by a SIGKILL.

Signed-off-by: Mike Christie <michael.chris...@oracle.com>
---
 drivers/vhost/scsi.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 40f9135e1a62..a0f2588270f2 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1768,6 +1768,19 @@ static int vhost_scsi_set_features(struct vhost_scsi 
*vs, u64 features)
        return 0;
 }
 
+static void vhost_scsi_stop_dev_work(struct vhost_dev *dev)
+{
+       struct vhost_scsi *vs = container_of(dev, struct vhost_scsi, dev);
+       struct vhost_scsi_target t;
+
+       mutex_lock(&vs->dev.mutex);
+       memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
+       mutex_unlock(&vs->dev.mutex);
+       vhost_scsi_clear_endpoint(vs, &t);
+       vhost_dev_stop(&vs->dev);
+       vhost_dev_cleanup(&vs->dev);
+}
+
 static int vhost_scsi_open(struct inode *inode, struct file *f)
 {
        struct vhost_scsi *vs;
@@ -1821,7 +1834,7 @@ static int vhost_scsi_open(struct inode *inode, struct 
file *f)
                vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
        }
        vhost_dev_init(&vs->dev, vqs, nvqs, UIO_MAXIOV, VHOST_SCSI_WEIGHT, 0,
-                      true, NULL, NULL);
+                      true, NULL, vhost_scsi_stop_dev_work);
 
        vhost_scsi_init_inflight(vs, NULL);
 
@@ -1843,14 +1856,8 @@ static int vhost_scsi_open(struct inode *inode, struct 
file *f)
 static int vhost_scsi_release(struct inode *inode, struct file *f)
 {
        struct vhost_scsi *vs = f->private_data;
-       struct vhost_scsi_target t;
 
-       mutex_lock(&vs->dev.mutex);
-       memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
-       mutex_unlock(&vs->dev.mutex);
-       vhost_scsi_clear_endpoint(vs, &t);
-       vhost_dev_stop(&vs->dev);
-       vhost_dev_cleanup(&vs->dev);
+       vhost_dev_stop_work(&vs->dev);
        kfree(vs->dev.vqs);
        kfree(vs->vqs);
        kfree(vs->old_inflight);
-- 
2.25.1

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