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Re: [Qemu-discuss] 回复: how use qemu device_add and drive_add

From: Kewei Yu
Subject: Re: [Qemu-discuss] 回复: how use qemu device_add and drive_add
Date: Wed, 16 Jul 2014 14:17:24 +0800

Hi Liang:
  I don't know how "device_del" handles usb_disk1, But I remembered device_del will auto delete the drive of a device for virtio-blk.
  If my mind is wrong, let me know please.
  Hope the information to be useful. 


2014-07-16 13:04 GMT+08:00 liang <address@hidden>:
thanks for your reply.

in my use, device_del usb_disk11 than  drive_del usb_disk1,
resulted assert too. 

in the end, I Commented out  hw/qdev.c line 439 .
    if (bus->parent) {
        QLIST_INSERT_HEAD(&bus->parent->child_bus, bus, sibling);
//        object_property_add_child(OBJECT(bus->parent), bus->name, OBJECT(bus), NULL);

but I don't know the consequences.

------------------ 原始邮件 ------------------
发件人: "Dale R. Worley";<address@hidden>;
发送时间: 2014年7月3日(星期四) 晚上11:23
收件人: "liang"<address@hidden>;
抄送: "qemu-discuss"<address@hidden>;
主题: Re: [Qemu-discuss] how use qemu device_add and drive_add

> From: "liang" <address@hidden>

> add device use:
> 1  drive_add 0 file=hotplug.raw,if=none,id=usb_disk1
> 2  device_add usb-storage,drive=usb_disk1,id=usb_disk11,removable=on‍
> and del device use:
> 3  drive_del  usb_disk1‍
> 4  device_del  usb_disk11‍
> but when command 4 the qemu allways "assertion failed: (obj->ref ==
> 0)‍" receive SIGABRT.‍

I expect that you must perform commands 3 and 4 in the reverse order:

  device_del usb_disk11
  drive_del usb_disk1

because the existence of usb_disk11 requires the existence of

I expect that if you attempt to delete usb_disk1 while usb_disk11
exists, then either (a) both usb_disk1 and usb_disk11 are deleted, or
(b) the attempt to delete usb_disk1 fails because usb_disk1 is "in

But I am a novice with Qemu.



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