Merge remote-tracking branch 'regulator/topic/max8997' into regulator-next

[karo-tx-linux.git] / drivers / vhost / vhost.c

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 34389f75fe65693a4ad5baa36715159fd5759bbb..9759249e6d908867cf72f53e5bb8e4ecc30db8ae 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -77,26 +77,38 @@ void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
        init_poll_funcptr(&poll->table, vhost_poll_func);
        poll->mask = mask;
        poll->dev = dev;
+       poll->wqh = NULL;
 
        vhost_work_init(&poll->work, fn);
 }
 
 /* Start polling a file. We add ourselves to file's wait queue. The caller must
  * keep a reference to a file until after vhost_poll_stop is called. */
-void vhost_poll_start(struct vhost_poll *poll, struct file *file)
+int vhost_poll_start(struct vhost_poll *poll, struct file *file)
 {
        unsigned long mask;
+       int ret = 0;
 
        mask = file->f_op->poll(file, &poll->table);
        if (mask)
                vhost_poll_wakeup(&poll->wait, 0, 0, (void *)mask);
+       if (mask & POLLERR) {
+               if (poll->wqh)
+                       remove_wait_queue(poll->wqh, &poll->wait);
+               ret = -EINVAL;
+       }
+
+       return ret;
 }
 
 /* Stop polling a file. After this function returns, it becomes safe to drop the
  * file reference. You must also flush afterwards. */
 void vhost_poll_stop(struct vhost_poll *poll)
 {
-       remove_wait_queue(poll->wqh, &poll->wait);
+       if (poll->wqh) {
+               remove_wait_queue(poll->wqh, &poll->wait);
+               poll->wqh = NULL;
+       }
 }
 
 static bool vhost_work_seq_done(struct vhost_dev *dev, struct vhost_work *work,
@@ -792,7 +804,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
                fput(filep);
 
        if (pollstart && vq->handle_kick)
-               vhost_poll_start(&vq->poll, vq->kick);
+               r = vhost_poll_start(&vq->poll, vq->kick);
 
        mutex_unlock(&vq->mutex);