linux-kernel - [PATCH 4.4 13/44] virtio: add ability to iterate over vqs

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Message-Id: <20180430190946.877993030@linuxfoundation.org>
Date:   Mon, 30 Apr 2018 12:24:24 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH 4.4 13/44] virtio: add ability to iterate over vqs

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael S. Tsirkin <mst@...hat.com>

commit 24a7e4d20783c0514850f24a5c41ede46ab058f0 upstream.

For cleanup it's helpful to be able to simply scan all vqs and discard
all data. Add an iterator to do that.

Cc: stable@...r.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/virtio.h |    3 +++
 1 file changed, 3 insertions(+)

--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -124,6 +124,9 @@ int virtio_device_freeze(struct virtio_d
 int virtio_device_restore(struct virtio_device *dev);
 #endif
 
+#define virtio_device_for_each_vq(vdev, vq) \
+	list_for_each_entry(vq, &vdev->vqs, list)
+
 /**
  * virtio_driver - operations for a virtio I/O driver
  * @driver: underlying device driver (populate name and owner).