Messages in this thread | | | Date | Fri, 04 Apr 2008 22:16:32 +0200 | From | Jiri Slaby <> | Subject | usb unbind/bind => WARNING at fs/sysfs/dir.c [Was: 2.6.25-rc8-mm1] |
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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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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