virtio-blk: fix remove oops

Do not unregister the major at device remove, since there might be
another device instances around.

(qemu) pci_del 0 11
(qemu) ACPI: PCI interrupt for device 0000:00:0b.0 disabled
(qemu) pci_del 0 10
(qemu) ------------[ cut here ]------------
WARNING: at block/genhd.c:126 unregister_blkdev+0x74/0x9e()
ACPI: PCI interrupt for device 0000:00:0a.0 disabled

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index fb283af..7e83b6c 100644 (file)
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -289,7 +289,6 @@ out:
 static void virtblk_remove(struct virtio_device *vdev)
 {
        struct virtio_blk *vblk = vdev->priv;
-       int major = vblk->disk->major;
 
        /* Nothing should be pending. */
        BUG_ON(!list_empty(&vblk->reqs));
@@ -299,7 +298,6 @@ static void virtblk_remove(struct virtio_device *vdev)
 
        blk_cleanup_queue(vblk->disk->queue);
        put_disk(vblk->disk);
-       unregister_blkdev(major, "virtblk");
        mempool_destroy(vblk->pool);
        vdev->config->del_vq(vblk->vq);
        kfree(vblk);