[PATCH 1/3] vhost: don't hold onto file pointer for VHOST_SET_VRING_CALL

[Eric Biggers <ebiggers3@gmail.com>]

From: Eric Biggers <ebiggers@google.com>

We already hold a reference to the eventfd_ctx, which is sufficient;
there's no need to hold a reference to the struct file as well.  So get
rid of vhost_virtqueue->call.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 drivers/vhost/vhost.c | 20 +++++---------------
 drivers/vhost/vhost.h |  1 -
 2 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 33ac2b186b85..ba589e87372e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -322,7 +322,6 @@ static void vhost_vq_reset(struct vhost_dev *dev,
 	vq->error = NULL;
 	vq->kick = NULL;
 	vq->call_ctx = NULL;
-	vq->call = NULL;
 	vq->log_ctx = NULL;
 	vhost_reset_is_le(vq);
 	vhost_disable_cross_endian(vq);
@@ -625,8 +624,6 @@ void vhost_dev_cleanup(struct vhost_dev *dev, bool locked)
 			fput(dev->vqs[i]->kick);
 		if (dev->vqs[i]->call_ctx)
 			eventfd_ctx_put(dev->vqs[i]->call_ctx);
-		if (dev->vqs[i]->call)
-			fput(dev->vqs[i]->call);
 		vhost_vq_reset(dev, dev->vqs[i]);
 	}
 	vhost_dev_free_iovecs(dev);
@@ -1488,19 +1485,12 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
 			r = -EFAULT;
 			break;
 		}
-		eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd);
-		if (IS_ERR(eventfp)) {
-			r = PTR_ERR(eventfp);
+		ctx = f.fd == -1 ? NULL : eventfd_ctx_fdget(f.fd);
+		if (IS_ERR(ctx)) {
+			r = PTR_ERR(ctx);
 			break;
 		}
-		if (eventfp != vq->call) {
-			filep = vq->call;
-			ctx = vq->call_ctx;
-			vq->call = eventfp;
-			vq->call_ctx = eventfp ?
-				eventfd_ctx_fileget(eventfp) : NULL;
-		} else
-			filep = eventfp;
+		swap(ctx, vq->call_ctx);
 		break;
 	case VHOST_SET_VRING_ERR:
 		if (copy_from_user(&f, argp, sizeof f)) {
@@ -1547,7 +1537,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
 	if (pollstop && vq->handle_kick)
 		vhost_poll_stop(&vq->poll);
 
-	if (ctx)
+	if (!IS_ERR_OR_NULL(ctx))
 		eventfd_ctx_put(ctx);
 	if (filep)
 		fput(filep);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 79c6e7a60a5e..41026c7d6842 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -96,7 +96,6 @@ struct vhost_virtqueue {
 	struct vring_used __user *used;
 	const struct vhost_umem_node *meta_iotlb[VHOST_NUM_ADDRS];
 	struct file *kick;
-	struct file *call;
 	struct file *error;
 	struct eventfd_ctx *call_ctx;
 	struct eventfd_ctx *error_ctx;
-- 
2.15.1