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 ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
