linux-kernel - [PATCH 2/4] virtio_ring: switch to use BAD

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Date:   Mon, 26 Dec 2022 15:49:06 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        maxime.coquelin@...hat.com, alvaro.karsz@...id-run.com,
        eperezma@...hat.com
Subject: [PATCH 2/4] virtio_ring: switch to use BAD_RING()

Switch to reuse BAD_RING() to allow common logic to be implemented in
BAD_RING().

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
Changes since V1:
- switch to use BAD_RING in virtio_break_device()
---
 drivers/virtio/virtio_ring.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 2e7689bb933b..5cfb2fa8abee 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -58,7 +58,8 @@
 	do {							\
 		dev_err(&_vq->vq.vdev->dev,			\
 			"%s:"fmt, (_vq)->vq.name, ##args);	\
-		(_vq)->broken = true;				\
+		/* Pairs with READ_ONCE() in virtqueue_is_broken(). */ \
+		WRITE_ONCE((_vq)->broken, true);		       \
 	} while (0)
 #define START_USE(vq)
 #define END_USE(vq)
@@ -2237,7 +2238,7 @@ bool virtqueue_notify(struct virtqueue *_vq)
 
 	/* Prod other side to tell it about changes. */
 	if (!vq->notify(_vq)) {
-		vq->broken = true;
+		BAD_RING(vq, "vq %d is broken\n", vq->vq.index);
 		return false;
 	}
 	return true;
@@ -2786,8 +2787,7 @@ void virtio_break_device(struct virtio_device *dev)
 	list_for_each_entry(_vq, &dev->vqs, list) {
 		struct vring_virtqueue *vq = to_vvq(_vq);
 
-		/* Pairs with READ_ONCE() in virtqueue_is_broken(). */
-		WRITE_ONCE(vq->broken, true);
+		BAD_RING(vq, "Device break vq %d", _vq->index);
 	}
 	spin_unlock(&dev->vqs_list_lock);
 }
-- 
2.25.1