linux-kernel - [PATCH 4.4 009/105] virtio: release virtio index when fail to device

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Date:   Fri, 15 Dec 2017 10:44:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        weiping zhang <zhangweiping@...ichuxing.com>,
        Cornelia Huck <cohuck@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH 4.4 009/105] virtio: release virtio index when fail to device_register

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

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

From: weiping zhang <zwp10758@...il.com>

commit e60ea67bb60459b95a50a156296041a13e0e380e upstream.

index can be reused by other virtio device.

Signed-off-by: weiping zhang <zhangweiping@...ichuxing.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/virtio/virtio.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -323,6 +323,8 @@ int register_virtio_device(struct virtio
 	/* device_register() causes the bus infrastructure to look for a
 	 * matching driver. */
 	err = device_register(&dev->dev);
+	if (err)
+		ida_simple_remove(&virtio_index_ida, dev->index);
 out:
 	if (err)
 		add_status(dev, VIRTIO_CONFIG_S_FAILED);