* sysfs: cannot create duplicate filename '/class/uas_host'
@ 2010-05-03 13:42 Ramya Desai
2010-05-04 14:47 ` Ramya Desai
0 siblings, 1 reply; 2+ messages in thread
From: Ramya Desai @ 2010-05-03 13:42 UTC (permalink / raw)
To: SCSI development list
Dear Experts,
When I attach two UAS devices to linux box, I got the following system
trace when I use my driver. I used the following snippet for
registering my device to the transport layer.
static DECLARE_TRANSPORT_CLASS(uas_host_class,
"uas_host", NULL, NULL, NULL);
error = transport_class_register(&uas_host_class);
The transport_class_register() API fails and shows the following trace
when I connect the second device
Here, I can declare the transport class with different names by
changing the second parameter in the DECLARE_TRANSPORT_CLASS. However,
is there any other way to handle this? Is there any way to declare
unique name for each device?
Any ideas greatly helpful.
Thanks and Regards,
Ramya.
System Trace:
[ 131.547243] WARNING: at fs/sysfs/dir.c:451 sysfs_add_one+0xd6/0x100()
[ 131.547246] Hardware name: System Product Name
[ 131.547247] sysfs: cannot create duplicate filename '/class/uas_host'
[ 131.547249] Modules linked in: usb_storage usb_libusual binfmt_misc
ppdev bridge stp bnep video output lp parport snd_hda_codec_analog
snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm
snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event
snd_seq snd_timer snd_seq_device psmouse snd serio_raw usbhid
soundcore iTCO_wdt xhci_hcd iTCO_vendor_support snd_page_alloc pcspkr
ohci1394 ieee1394 ehci_hcd uhci_hcd sky2 usbcore floppy
[ 131.547276] Pid: 672, comm: khubd Not tainted 2.6.34-rc4 #1
[ 131.547278] Call Trace:
[ 131.547282] [<c024a0f6>] ? sysfs_add_one+0xd6/0x100
[ 131.547284] [<c024a0f6>] ? sysfs_add_one+0xd6/0x100
[ 131.547288] [<c014288c>] warn_slowpath_common+0x6c/0xc0
[ 131.547291] [<c024a0f6>] ? sysfs_add_one+0xd6/0x100
[ 131.547293] [<c0142926>] warn_slowpath_fmt+0x26/0x30
[ 131.547296] [<c024a0f6>] sysfs_add_one+0xd6/0x100
[ 131.547299] [<c024aa99>] create_dir+0x49/0x90
[ 131.547302] [<c024ab0b>] sysfs_create_dir+0x2b/0x50
[ 131.547306] [<c031deb2>] ? kobject_get+0x12/0x20
[ 131.547309] [<c031dfee>] kobject_add_internal+0xbe/0x1b0
[ 131.547312] [<c03273e3>] ? kvasprintf+0x43/0x60
[ 131.547316] [<c031e107>] kset_register+0x27/0x50
[ 131.547320] [<c03b62ac>] __class_register+0xfc/0x200
[ 131.547326] [<f8104ffe>] ? usb_stor_probe1+0x8fe/0x9c0 [usb_storage]
[ 131.547330] [<c03b8b5d>] transport_class_register+0xd/0x10
[ 131.547334] [<f8104c9a>] usb_stor_probe1+0x59a/0x9c0 [usb_storage]
[ 131.547339] [<c024a5a5>] ? sysfs_addrm_finish+0x15/0xc0
[ 131.547345] [<f8105124>] storage_probe+0x64/0x80 [usb_storage]
[ 131.547358] [<f8319a24>] usb_probe_interface+0xe4/0x170 [usbcore]
[ 131.547365] [<c03b54b9>] driver_probe_device+0x69/0x170
[ 131.547374] [<f8319071>] ? usb_match_id+0x41/0x60 [usbcore]
[ 131.547378] [<c03b5691>] __device_attach+0x41/0x50
[ 131.547381] [<c03b4a4b>] bus_for_each_drv+0x5b/0x80
[ 131.547384] [<c03b573b>] device_attach+0x6b/0x70
[ 131.547387] [<c03b5650>] ? __device_attach+0x0/0x50
[ 131.547390] [<c03b4845>] bus_probe_device+0x25/0x40
[ 131.547393] [<c03b2f47>] device_add+0x367/0x590
[ 131.547396] [<c03273e3>] ? kvasprintf+0x43/0x60
[ 131.547403] [<f8318a53>] usb_set_configuration+0x4a3/0x6e0 [usbcore]
[ 131.547412] [<f8321489>] generic_probe+0x39/0xb0 [usbcore]
[ 131.547419] [<f8319483>] usb_probe_device+0x43/0x50 [usbcore]
[ 131.547427] [<c03b54b9>] driver_probe_device+0x69/0x170
[ 131.547431] [<c03b5691>] __device_attach+0x41/0x50
[ 131.547433] [<c03b4a4b>] bus_for_each_drv+0x5b/0x80
[ 131.547437] [<c03b573b>] device_attach+0x6b/0x70
[ 131.547440] [<c03b5650>] ? __device_attach+0x0/0x50
[ 131.547443] [<c03b4845>] bus_probe_device+0x25/0x40
[ 131.547445] [<c03b2f47>] device_add+0x367/0x590
[ 131.547450] [<c0564c02>] ? printk+0x18/0x1e
[ 131.547456] [<f830dd4b>] ? show_string+0x4b/0x50 [usbcore]
[ 131.547463] [<f8320036>] ? usbdev_do_ioctl+0x5c6/0x1620 [usbcore]
[ 131.547470] [<f8310d9c>] usb_new_device+0x18c/0x1e0 [usbcore]
[ 131.547477] [<f8312b37>] hub_thread+0xd27/0x14a0 [usbcore]
[ 131.547481] [<c0560009>] ? init_centaur+0x13f/0x400
[ 131.547485] [<c012c7f0>] ? __wake_up_common+0x40/0x70
[ 131.547488] [<c015dd30>] ? autoremove_wake_function+0x0/0x50
[ 131.547494] [<f8311e10>] ? hub_thread+0x0/0x14a0 [usbcore]
[ 131.547497] [<c015d914>] kthread+0x74/0x80
[ 131.547500] [<c015d8a0>] ? kthread+0x0/0x80
[ 131.547503] [<c01033b6>] kernel_thread_helper+0x6/0x10
[ 131.547506] ---[ end trace 27622b3e9393b1d6 ]---
[ 131.547509] kobject_add_internal failed for uas_host with -EEXIST,
don't try to register things with the same name in the same directory.
[ 131.547514] Pid: 672, comm: khubd Tainted: G W 2.6.34-rc4 #1
[ 131.547516] Call Trace:
[ 131.547518] [<c0564c02>] ? printk+0x18/0x1e
[ 131.547521] [<c031e032>] kobject_add_internal+0x102/0x1b0
[ 131.547525] [<c031e107>] kset_register+0x27/0x50
[ 131.547528] [<c03b62ac>] __class_register+0xfc/0x200
[ 131.547532] [<f8104ffe>] ? usb_stor_probe1+0x8fe/0x9c0 [usb_storage]
[ 131.547536] [<c03b8b5d>] transport_class_register+0xd/0x10
[ 131.547540] [<f8104c9a>] usb_stor_probe1+0x59a/0x9c0 [usb_storage]
[ 131.547544] [<c024a5a5>] ? sysfs_addrm_finish+0x15/0xc0
[ 131.547548] [<f8105124>] storage_probe+0x64/0x80 [usb_storage]
[ 131.547556] [<f8319a24>] usb_probe_interface+0xe4/0x170 [usbcore]
[ 131.547561] [<c03b54b9>] driver_probe_device+0x69/0x170
[ 131.547567] [<f8319071>] ? usb_match_id+0x41/0x60 [usbcore]
[ 131.547571] [<c03b5691>] __device_attach+0x41/0x50
[ 131.547574] [<c03b4a4b>] bus_for_each_drv+0x5b/0x80
[ 131.547577] [<c03b573b>] device_attach+0x6b/0x70
[ 131.547580] [<c03b5650>] ? __device_attach+0x0/0x50
[ 131.547583] [<c03b4845>] bus_probe_device+0x25/0x40
[ 131.547585] [<c03b2f47>] device_add+0x367/0x590
[ 131.547588] [<c03273e3>] ? kvasprintf+0x43/0x60
[ 131.547595] [<f8318a53>] usb_set_configuration+0x4a3/0x6e0 [usbcore]
[ 131.547603] [<f8321489>] generic_probe+0x39/0xb0 [usbcore]
[ 131.547611] [<f8319483>] usb_probe_device+0x43/0x50 [usbcore]
[ 131.547615] [<c03b54b9>] driver_probe_device+0x69/0x170
[ 131.547619] [<c03b5691>] __device_attach+0x41/0x50
[ 131.547622] [<c03b4a4b>] bus_for_each_drv+0x5b/0x80
[ 131.547625] [<c03b573b>] device_attach+0x6b/0x70
[ 131.547629] [<c03b5650>] ? __device_attach+0x0/0x50
[ 131.547633] [<c03b4845>] bus_probe_device+0x25/0x40
[ 131.547637] [<c03b2f47>] device_add+0x367/0x590
[ 131.547641] [<c0564c02>] ? printk+0x18/0x1e
[ 131.547650] [<f830dd4b>] ? show_string+0x4b/0x50 [usbcore]
[ 131.547660] [<f8320036>] ? usbdev_do_ioctl+0x5c6/0x1620 [usbcore]
[ 131.547668] [<f8310d9c>] usb_new_device+0x18c/0x1e0 [usbcore]
[ 131.547675] [<f8312b37>] hub_thread+0xd27/0x14a0 [usbcore]
[ 131.547679] [<c0560009>] ? init_centaur+0x13f/0x400
[ 131.547682] [<c012c7f0>] ? __wake_up_common+0x40/0x70
[ 131.547685] [<c015dd30>] ? autoremove_wake_function+0x0/0x50
[ 131.547691] [<f8311e10>] ? hub_thread+0x0/0x14a0 [usbcore]
[ 131.547694] [<c015d914>] kthread+0x74/0x80
[ 131.547696] [<c015d8a0>] ? kthread+0x0/0x80
[ 131.547699] [<c01033b6>] kernel_thread_helper+0x6/0x10
[ 131.547701] usb-storage: storage_probe() failed
[ 131.547703] usb-storage: -- usb_stor_release_resources
[ 131.547706] BUG: unable to handle kernel NULL pointer dereference at 00000004
[ 131.547709] IP: [<f8103e4b>] release_everything+0x12b/0x390 [usb_storage]
[ 131.547714] *pde = 00000000
[ 131.547716] Oops: 0000 [#1] SMP
[ 131.547718] last sysfs file:
/sys/devices/pci0000:00/0000:00:09.0/0000:04:00.0/0000:05:01.0/0000:06:00.0/usb9/9-1/product
[ 131.547722] Modules linked in: usb_storage usb_libusual binfmt_misc
ppdev bridge stp bnep video output lp parport snd_hda_codec_analog
snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm
snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event
snd_seq snd_timer snd_seq_device psmouse snd serio_raw usbhid
soundcore iTCO_wdt xhci_hcd iTCO_vendor_support snd_page_alloc pcspkr
ohci1394 ieee1394 ehci_hcd uhci_hcd sky2 usbcore floppy
[ 131.547746]
[ 131.547748] Pid: 672, comm: khubd Tainted: G W 2.6.34-rc4
#1 P6T DELUXE V2/System Product Name
[ 131.547751] EIP: 0060:[<f8103e4b>] EFLAGS: 00010246 CPU: 4
[ 131.547754] EIP is at release_everything+0x12b/0x390 [usb_storage]
[ 131.547757] EAX: 00000000 EBX: f71ae284 ECX: 00009999 EDX: 00000096
[ 131.547759] ESI: f71ae000 EDI: f71ae284 EBP: c3505b98 ESP: c3505b74
[ 131.547761] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 131.547764] Process khubd (pid: 672, ti=c3504000 task=c3466600
task.ti=c3504000)
[ 131.547766] Stack:
[ 131.547767] f810cbd0 f810c0a4 00000000 f71ae000 f71ae284 c3505b98
00000000 f71ae000
[ 131.547771] <0> f71ae284 c3505bf0 f8104cb4 f810f654 f810c0f1
0000000f c3206c84 0000000f
[ 131.547776] <0> 00000047 205b5bc8 31333120 f6aed400 5d313637
c3500020 f807bbf8 f71ae284
[ 131.547781] Call Trace:
[ 131.547785] [<f8104cb4>] ? usb_stor_probe1+0x5b4/0x9c0 [usb_storage]
[ 131.547789] [<c024a5a5>] ? sysfs_addrm_finish+0x15/0xc0
[ 131.547793] [<f8105124>] ? storage_probe+0x64/0x80 [usb_storage]
[ 131.547801] [<f8319a24>] ? usb_probe_interface+0xe4/0x170 [usbcore]
[ 131.547805] [<c03b54b9>] ? driver_probe_device+0x69/0x170
[ 131.547812] [<f8319071>] ? usb_match_id+0x41/0x60 [usbcore]
[ 131.547815] [<c03b5691>] ? __device_attach+0x41/0x50
[ 131.547819] [<c03b4a4b>] ? bus_for_each_drv+0x5b/0x80
[ 131.547822] [<c03b573b>] ? device_attach+0x6b/0x70
[ 131.547825] [<c03b5650>] ? __device_attach+0x0/0x50
[ 131.547828] [<c03b4845>] ? bus_probe_device+0x25/0x40
[ 131.547830] [<c03b2f47>] ? device_add+0x367/0x590
[ 131.547833] [<c03273e3>] ? kvasprintf+0x43/0x60
[ 131.547841] [<f8318a53>] ? usb_set_configuration+0x4a3/0x6e0 [usbcore]
[ 131.547850] [<f8321489>] ? generic_probe+0x39/0xb0 [usbcore]
[ 131.547861] [<f8319483>] ? usb_probe_device+0x43/0x50 [usbcore]
[ 131.547867] [<c03b54b9>] ? driver_probe_device+0x69/0x170
[ 131.547872] [<c03b5691>] ? __device_attach+0x41/0x50
[ 131.547876] [<c03b4a4b>] ? bus_for_each_drv+0x5b/0x80
[ 131.547881] [<c03b573b>] ? device_attach+0x6b/0x70
[ 131.547885] [<c03b5650>] ? __device_attach+0x0/0x50
[ 131.547889] [<c03b4845>] ? bus_probe_device+0x25/0x40
[ 131.547892] [<c03b2f47>] ? device_add+0x367/0x590
[ 131.547895] [<c0564c02>] ? printk+0x18/0x1e
[ 131.547902] [<f830dd4b>] ? show_string+0x4b/0x50 [usbcore]
[ 131.547909] [<f8320036>] ? usbdev_do_ioctl+0x5c6/0x1620 [usbcore]
[ 131.547916] [<f8310d9c>] ? usb_new_device+0x18c/0x1e0 [usbcore]
[ 131.547923] [<f8312b37>] ? hub_thread+0xd27/0x14a0 [usbcore]
[ 131.547927] [<c0560009>] ? init_centaur+0x13f/0x400
[ 131.547930] [<c012c7f0>] ? __wake_up_common+0x40/0x70
[ 131.547934] [<c015dd30>] ? autoremove_wake_function+0x0/0x50
[ 131.547940] [<f8311e10>] ? hub_thread+0x0/0x14a0 [usbcore]
[ 131.547943] [<c015d914>] ? kthread+0x74/0x80
[ 131.547946] [<c015d8a0>] ? kthread+0x0/0x80
[ 131.547948] [<c01033b6>] ? kernel_thread_helper+0x6/0x10
[ 131.547950] Code: 00 00 00 e8 38 97 20 00 8b 43 18 31 d2 83 c0 1c
e8 5b 13 2b c8 8d 83 7c fd ff ff e8 b0 20 2c c8 83 c4 18 5b 5e 5f 5d
c3 8b 43 18 <8b> 40 04 0f b6 50 04 8b 40 0c 83 ea 01 e8 f3 f9 ff ff 85
c0 89
[ 131.547975] EIP: [<f8103e4b>] release_everything+0x12b/0x390
[usb_storage] SS:ESP 0068:c3505b74
[ 131.547980] CR2: 0000000000000004
[ 131.547982] ---[ end trace 27622b3e9393b1d7 ]---
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: sysfs: cannot create duplicate filename '/class/uas_host'
2010-05-03 13:42 sysfs: cannot create duplicate filename '/class/uas_host' Ramya Desai
@ 2010-05-04 14:47 ` Ramya Desai
0 siblings, 0 replies; 2+ messages in thread
From: Ramya Desai @ 2010-05-04 14:47 UTC (permalink / raw)
To: SCSI development list
On Mon, May 3, 2010 at 7:12 PM, Ramya Desai <ramya.desai@gmail.com> wrote:
> Dear Experts,
>
> When I attach two UAS devices to linux box, I got the following system
> trace when I use my driver. I used the following snippet for
> registering my device to the transport layer.
>
> static DECLARE_TRANSPORT_CLASS(uas_host_class,
> "uas_host", NULL, NULL, NULL);
>
> error = transport_class_register(&uas_host_class);
>
> The transport_class_register() API fails and shows the following trace
> when I connect the second device
>
> Here, I can declare the transport class with different names by
> changing the second parameter in the DECLARE_TRANSPORT_CLASS. However,
> is there any other way to handle this? Is there any way to declare
> unique name for each device?
>
> Any ideas greatly helpful.
>
> Thanks and Regards,
> Ramya.
Dear Experts,
I resolved the issue, after some research. The
transport_class_register() API is moved from PROBE method to INIT
module as it is NOT per device registration, but, it is per driver
registration. That is, for each driver, we need to register one time,
but not for each device insertion.
After moving the registration API call to INIT module, I am able to
work with TWO devices simultaneously.
Thanks and Regards,
Ramya.
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^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-05-03 13:42 sysfs: cannot create duplicate filename '/class/uas_host' Ramya Desai
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