On 08/11/2010 11:21 AM, Jiri Kosina wrote:
On Wed, 11 Aug 2010, Alan Ott wrote:Hello, I'm having a bit of trouble with hidraw (with a USB device) and device removal. When I remove a device and re-attach it, the original device does not get removed, and another node is added to /dev. At boot: no /dev/hidraw devices exist attach a device: /dev/hidraw0 exists detach the device: /dev/hidraw0 remains re-attach the device: /dev/hidraw0 exists (defunct) /dev/hidraw1 exists This is with 2.6.35+ from git, revision 3d30701b58970425e1d, updated about 30 minutes ago. Aug 11 11:04:15 ato kernel: [ 109.554287] ------------[ cut here ]------------ Aug 11 11:04:15 ato kernel: [ 109.554300] WARNING: at lib/kobject.c:595 kobject_put+0x50/0x60() Aug 11 11:04:15 ato kernel: [ 109.554306] Hardware name: GA-MA770T-UD3P Aug 11 11:04:15 ato kernel: [ 109.554311] kobject: '(null)' (ffff880244a49898): is not initialized, yet kobject_put() is being called. Aug 11 11:04:15 ato kernel: [ 109.554317] Modules linked in: usbhid hid binfmt_misc fbcon tileblit font bitblit softcursor snd_hda_codec_nvhdmi nouveau snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss ttm drm_kms_helper snd_mixer_oss snd_pcm drm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi ppdev parport_pc snd_seq_midi_event snd_seq psmouse lp snd_timer parport i2c_algo_bit edac_core video edac_mce_amd i2c_piix4 snd_seq_device serio_raw snd soundcore snd_page_alloc output ohci1394 floppy pata_atiixp ieee1394 ahci libahci r8169 mii Aug 11 11:04:15 ato kernel: [ 109.554399] Pid: 29, comm: khubd Not tainted 2.6.35+ #19 Aug 11 11:04:15 ato kernel: [ 109.554404] Call Trace: Aug 11 11:04:15 ato kernel: [ 109.554416] [<ffffffff8105de1f>] warn_slowpath_common+0x7f/0xc0 Aug 11 11:04:15 ato kernel: [ 109.554425] [<ffffffff8105df16>] warn_slowpath_fmt+0x46/0x50 Aug 11 11:04:15 ato kernel: [ 109.554434] [<ffffffff812a47c0>] kobject_put+0x50/0x60 Aug 11 11:04:15 ato kernel: [ 109.554442] [<ffffffff8135c6b7>] put_device+0x17/0x20 Aug 11 11:04:15 ato kernel: [ 109.554455] [<ffffffffa0238998>] hid_destroy_device+0x48/0x60 [hid] Aug 11 11:04:15 ato kernel: [ 109.554466] [<ffffffffa00f2aeb>] usbhid_disconnect+0x2b/0x50 [usbhid] Aug 11 11:04:15 ato kernel: [ 109.554477] [<ffffffff813d620a>] usb_unbind_interface+0x5a/0x1a0 Aug 11 11:04:15 ato kernel: [ 109.554487] [<ffffffff81360645>] __device_release_driver+0x75/0xe0 Aug 11 11:04:15 ato kernel: [ 109.554495] [<ffffffff813607ad>] device_release_driver+0x2d/0x40 Aug 11 11:04:15 ato kernel: [ 109.554503] [<ffffffff8135f79e>] bus_remove_device+0xae/0xf0 Aug 11 11:04:15 ato kernel: [ 109.554510] [<ffffffff8135d437>] device_del+0x127/0x1d0 Aug 11 11:04:15 ato kernel: [ 109.554519] [<ffffffff813d2b88>] usb_disable_device+0xa8/0x130 Aug 11 11:04:15 ato kernel: [ 109.554527] [<ffffffff813cbe65>] usb_disconnect+0x95/0x130 Aug 11 11:04:15 ato kernel: [ 109.554535] [<ffffffff813cd51d>] hub_thread+0x48d/0x1210 Aug 11 11:04:15 ato kernel: [ 109.554544] [<ffffffff8105771b>] ? dequeue_task_fair+0x8b/0x90 Aug 11 11:04:15 ato kernel: [ 109.554555] [<ffffffff8107e490>] ? autoremove_wake_function+0x0/0x40 Aug 11 11:04:15 ato kernel: [ 109.554563] [<ffffffff813cd090>] ? hub_thread+0x0/0x1210 Aug 11 11:04:15 ato kernel: [ 109.554571] [<ffffffff8107df36>] kthread+0x96/0xa0 Aug 11 11:04:15 ato kernel: [ 109.554580] [<ffffffff8100be64>] kernel_thread_helper+0x4/0x10 Aug 11 11:04:15 ato kernel: [ 109.554588] [<ffffffff8107dea0>] ? kthread+0x0/0xa0 Aug 11 11:04:15 ato kernel: [ 109.554595] [<ffffffff8100be60>] ? kernel_thread_helper+0x0/0x10 Aug 11 11:04:15 ato kernel: [ 109.554601] ---[ end trace 212263bbb326ec69 ]--- Aug 11 11:04:21 ato kernel: [ 116.450553] usb 1-5.4: new full speed USB device using ehci_hcd and address 7 Aug 11 11:04:22 ato kernel: [ 116.576230] generic-usb 0003:04D8:003F.0002: hiddev0,hidraw1: USB HID v1.11 Device [Microchip Technology Inc. Simple HID Device Demo] on usb-0000:00:12.2-5.4/input0 Aug 11 11:04:23 ato kernel: [ 117.746427] usb 1-5.4: USB disconnect, address 7 Aug 11 11:04:23 ato kernel: [ 117.746500] ------------[ cut here ]------------ lan@ato:~/work/linux-2.6$ scripts/ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux ato 2.6.35+ #19 SMP Wed Aug 11 10:53:49 EDT 2010 x86_64 GNU/Linux Gnu C 4.4.3 Gnu make 3.81 binutils 2.20.1 util-linux 2.17.2 mount support module-init-tools 3.11.1 e2fsprogs 1.41.11 pcmciautils 014 Linux C Library 2.11.1 Dynamic linker (ldd) 2.11.1 Procps 3.2.8 Net-tools 1.60 Kbd 1.15 Sh-utils 7.4 wireless-tools 30 Modules Loaded usbhid hid binfmt_misc fbcon tileblit font bitblit softcursor snd_hda_codec_nvhdmi nouveau snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss ttm drm_kms_helper snd_mixer_oss snd_pcm drm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi ppdev parport_pc snd_seq_midi_event snd_seq psmouse lp snd_timer parport i2c_algo_bit edac_core video edac_mce_amd i2c_piix4 snd_seq_device serio_raw snd soundcore snd_page_alloc output ohci1394 floppy pata_atiixp ieee1394 ahci libahci r8169 miiThis looks very similar to http://lkml.org/lkml/2010/8/10/373 I have not yet root-caused this, but I am not aware of any recent changes in usb-hid that might be causing that, so I suspect some change in USB core. But will have to investigate.
I just tried it with a Bluetooth HID keyboard and it works as expected. I'd suspect it to not be a HID problem.
Alan. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
