linux-kernel - [PATCH 3.16 045/254] virtio: release virtio index when fail to device

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Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "weiping zhang" <zwp10758@...il.com>,
        "weiping zhang" <zhangweiping@...ichuxing.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Cornelia Huck" <cohuck@...hat.com>
Subject: [PATCH 3.16 045/254] virtio: release virtio index when fail to
 device_register

3.16.55-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/virtio/virtio.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -223,6 +223,8 @@ 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);