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    Subjectusb unbind/bind => WARNING at fs/sysfs/dir.c [Was: 2.6.25-rc8-mm1]
    On 04/02/2008 06:32 AM, Andrew Morton wrote:
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc8/2.6.25-rc8-mm1/

    After
    $ echo -n 4-1.2 >/sys/bus/usb/drivers/usb/unbind
    $ echo -n 4-1.2 >/sys/bus/usb/drivers/usb/bind

    I have this in logs:

    sysfs: duplicate filename 'usbdev4.12_ep81' can not be created
    ------------[ cut here ]------------
    WARNING: at /home/l/latest/xxx/fs/sysfs/dir.c:425 sysfs_add_one+0x99/0xc0()
    Modules linked in: usbhid hid nls_cp437 vfat fat usb_storage tun bitrev ipv6
    arc4 ecb crypto_blkcipher cryptomgr crypto_algapi ath5k mac80211 sr_mod crc32
    ohci1394 rtc_cmos cfg80211 ieee1394 floppy rtc_core ehci_hcd rtc_lib ff_memless
    cdrom [last unloaded: hid]
    Pid: 539, comm: bash Tainted: G W 2.6.25-rc8-mm1_64 #395

    Call Trace:
    [<ffffffff8022f07f>] warn_on_slowpath+0x5f/0x80
    [<ffffffff80230197>] ? printk+0x67/0x70
    [<ffffffff802d9bd0>] ? sysfs_ilookup_test+0x0/0x20
    [<ffffffff802a12e8>] ? ifind+0x58/0xc0
    [<ffffffff802d9bd0>] ? sysfs_ilookup_test+0x0/0x20
    [<ffffffff802d9f49>] sysfs_add_one+0x99/0xc0
    [<ffffffff802daf68>] sysfs_create_link+0xa8/0x130
    [<ffffffff8038ebda>] device_add+0x2aa/0x4d0
    [<ffffffff80310c26>] ? kobject_init+0x36/0x80
    [<ffffffff8038ee19>] device_register+0x19/0x20
    [<ffffffff803dbbec>] usb_create_ep_files+0x19c/0x320
    [<ffffffff803dadb3>] usb_create_sysfs_intf_files+0xd3/0x100
    [<ffffffff803d630c>] usb_set_configuration+0x3ac/0x5f0
    [<ffffffff803df81a>] generic_probe+0x7a/0xb0
    [<ffffffff803d83fa>] usb_probe_device+0x3a/0x40
    [<ffffffff80390ceb>] driver_probe_device+0x9b/0x1a0
    [<ffffffff803901b3>] driver_bind+0xb3/0x100
    [<ffffffff8038f8a7>] drv_attr_store+0x27/0x30
    [<ffffffff802d94ab>] sysfs_write_file+0xeb/0x140
    [<ffffffff8028cc57>] vfs_write+0xc7/0x170
    [<ffffffff8028d2f0>] sys_write+0x50/0x90
    [<ffffffff8020b5eb>] system_call_after_swapgs+0x7b/0x80

    ---[ end trace 6ee6d593d4e510b4 ]---




    I think, this is a 2.6.25-rc5-mm1 regression, there
    while :; do
    echo -n 4-1.2 >/sys/bus/usb/drivers/usb/unbind
    echo -n 4-1.2 >/sys/bus/usb/drivers/usb/bind
    usleep 10000
    done
    went just fine for about 2000 times. Also real disconnect/connect works just
    fine (on disconnect the link disappears). Do you need kobject debug output?




    The dir looks like:
    ...
    usbdev4.10_ep83 ->
    ../../devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.3/4-1.3:1.0/usb_endpoint/usbdev4.10_ep83
    usbdev4.12_ep81 ->
    ../../devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.2/4-1.2:1.0/usb_endpoint/usbdev4.12_ep81

    ^^^^
    this is the unbound, the link is broken, there is no such device even after
    binding it back.

    usbdev4.1_ep00 ->
    ../../devices/pci0000:00/0000:00:1d.0/usb4/usb_endpoint/usbdev4.1_ep00
    usbdev4.1_ep81 ->
    ../../devices/pci0000:00/0000:00:1d.0/usb4/4-0:1.0/usb_endpoint/usbdev4.1_ep81
    usbdev4.5_ep00 ->
    ../../devices/pci0000:00/0000:00:1d.0/usb4/4-1/usb_endpoint/usbdev4.5_ep00
    ...


    The device is:
    Bus 004 Device 012: ID 045e:00f0 Microsoft Corp.
    Device Descriptor:
    bLength 18
    bDescriptorType 1
    bcdUSB 2.00
    bDeviceClass 0 (Defined at Interface level)
    bDeviceSubClass 0
    bDeviceProtocol 0
    bMaxPacketSize0 8
    idVendor 0x045e Microsoft Corp.
    idProduct 0x00f0
    bcdDevice 1.01
    iManufacturer 1 Microsoft Corporation
    iProduct 2 Microsoft � Laser Mouse 6000
    iSerial 0
    bNumConfigurations 1
    Configuration Descriptor:
    bLength 9
    bDescriptorType 2
    wTotalLength 34
    bNumInterfaces 1
    bConfigurationValue 1
    iConfiguration 0
    bmAttributes 0xa0
    (Bus Powered)
    Remote Wakeup
    MaxPower 100mA
    Interface Descriptor:
    bLength 9
    bDescriptorType 4
    bInterfaceNumber 0
    bAlternateSetting 0
    bNumEndpoints 1
    bInterfaceClass 3 Human Interface Devices
    bInterfaceSubClass 1 Boot Interface Subclass
    bInterfaceProtocol 2 Mouse
    iInterface 0
    HID Device Descriptor:
    bLength 9
    bDescriptorType 33
    bcdHID 1.11
    bCountryCode 33 US
    bNumDescriptors 1
    bDescriptorType 34 Report
    wDescriptorLength 59
    Report Descriptors:
    ** UNAVAILABLE **
    Endpoint Descriptor:
    bLength 7
    bDescriptorType 5
    bEndpointAddress 0x81 EP 1 IN
    bmAttributes 3
    Transfer Type Interrupt
    Synch Type None
    Usage Type Data
    wMaxPacketSize 0x0004 1x 4 bytes
    bInterval 10
    Device Status: 0x0000
    (Bus Powered)
    --
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