[PATCH V3 1/8] vhost: get rid of vhost_poll_flush() wrapper

Mike Christie
Tue, 17 May 2022 18:08:43 -0000

From: Andrey Ryabinin <arbn at yandex-team.com>

vhost_poll_flush() is a simple wrapper around vhost_work_dev_flush().
It gives wrong impression that we are doing some work over vhost_poll,
while in fact it flushes vhost_poll->dev.
It only complicate understanding of the code and leads to mistakes
like flushing the same vhost_dev several times in a row.

Just remove vhost_poll_flush() and call vhost_work_dev_flush() directly.

Signed-off-by: Andrey Ryabinin <arbn at yandex-team.com>
[merge vhost_poll_flush removal from Stefano Garzarella]
Signed-off-by: Mike Christie <michael.christie at oracle.com>
Reviewed-by: Chaitanya Kulkarni <kch at nvidia.com>
Acked-by: Jason Wang <jasowang at redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare at redhat.com>
---
 drivers/vhost/net.c   |  4 ++--
 drivers/vhost/test.c  |  2 +-
 drivers/vhost/vhost.c | 12 ++----------
 drivers/vhost/vhost.h |  1 -
 drivers/vhost/vsock.c |  2 +-
 5 files changed, 6 insertions(+), 15 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 792ab5f23647..4e55ad8c942a 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1376,8 +1376,8 @@ static void vhost_net_stop(struct vhost_net *n, struct
socket **tx_sock,

 static void vhost_net_flush_vq(struct vhost_net *n, int index)
 {
-	vhost_poll_flush(n->poll + index);
-	vhost_poll_flush(&n->vqs[index].vq.poll);
+	vhost_work_dev_flush(n->poll[index].dev);
+	vhost_work_dev_flush(n->vqs[index].vq.poll.dev);
 }

 static void vhost_net_flush(struct vhost_net *n)
diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index 05740cba1cd8..f0ac9e35f5d6 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -146,7 +146,7 @@ static void vhost_test_stop(struct vhost_test *n, void
**privatep)

 static void vhost_test_flush_vq(struct vhost_test *n, int index)
 {
-	vhost_poll_flush(&n->vqs[index].poll);
+	vhost_work_dev_flush(n->vqs[index].poll.dev);
 }

 static void vhost_test_flush(struct vhost_test *n)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index d02173fb290c..1d84a2818c6f 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -245,14 +245,6 @@ void vhost_work_dev_flush(struct vhost_dev *dev)
 }
 EXPORT_SYMBOL_GPL(vhost_work_dev_flush);

-/* Flush any work that has been scheduled. When calling this, don't hold
any
- * locks that are also used by the callback. */
-void vhost_poll_flush(struct vhost_poll *poll)
-{
-	vhost_work_dev_flush(poll->dev);
-}
-EXPORT_SYMBOL_GPL(vhost_poll_flush);
-
 void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
 {
 	if (!dev->worker)
@@ -663,7 +655,7 @@ void vhost_dev_stop(struct vhost_dev *dev)
 	for (i = 0; i < dev->nvqs; ++i) {
 		if (dev->vqs[i]->kick && dev->vqs[i]->handle_kick) {
 			vhost_poll_stop(&dev->vqs[i]->poll);
-			vhost_poll_flush(&dev->vqs[i]->poll);
+			vhost_work_dev_flush(dev->vqs[i]->poll.dev);
 		}
 	}
 }
@@ -1719,7 +1711,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int
ioctl, void __user *arg
 	mutex_unlock(&vq->mutex);

 	if (pollstop && vq->handle_kick)
-		vhost_poll_flush(&vq->poll);
+		vhost_work_dev_flush(vq->poll.dev);
 	return r;
 }
 EXPORT_SYMBOL_GPL(vhost_vring_ioctl);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 638bb640d6b4..aeb8e1ad1496 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -44,7 +44,6 @@ void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t
fn,
 		     __poll_t mask, struct vhost_dev *dev);
 int vhost_poll_start(struct vhost_poll *poll, struct file *file);
 void vhost_poll_stop(struct vhost_poll *poll);
-void vhost_poll_flush(struct vhost_poll *poll);
 void vhost_poll_queue(struct vhost_poll *poll);
 void vhost_work_dev_flush(struct vhost_dev *dev);

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index e6c9d41db1de..a4c8ae92a0fb 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -709,7 +709,7 @@ static void vhost_vsock_flush(struct vhost_vsock *vsock)

 	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++)
 		if (vsock->vqs[i].handle_kick)
-			vhost_poll_flush(&vsock->vqs[i].poll);
+			vhost_work_dev_flush(vsock->vqs[i].poll.dev);
 	vhost_work_dev_flush(&vsock->dev);
 }

--
2.25.1