From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Ott Subject: PROBLEM: HIDRAW: /dev/hidraw* device does not get removed when unplugged Date: Wed, 11 Aug 2010 11:15:17 -0400 Message-ID: <4C62BE85.2040803@signal11.us> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jiri Kosina , Antonio Ospite List-Id: linux-input@vger.kernel.org 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] [] warn_slowpath_common+0x7f/0xc0 Aug 11 11:04:15 ato kernel: [ 109.554425] [] warn_slowpath_fmt+0x46/0x50 Aug 11 11:04:15 ato kernel: [ 109.554434] [] kobject_put+0x50/0x60 Aug 11 11:04:15 ato kernel: [ 109.554442] [] put_device+0x17/0x20 Aug 11 11:04:15 ato kernel: [ 109.554455] [] hid_destroy_device+0x48/0x60 [hid] Aug 11 11:04:15 ato kernel: [ 109.554466] [] usbhid_disconnect+0x2b/0x50 [usbhid] Aug 11 11:04:15 ato kernel: [ 109.554477] [] usb_unbind_interface+0x5a/0x1a0 Aug 11 11:04:15 ato kernel: [ 109.554487] [] __device_release_driver+0x75/0xe0 Aug 11 11:04:15 ato kernel: [ 109.554495] [] device_release_driver+0x2d/0x40 Aug 11 11:04:15 ato kernel: [ 109.554503] [] bus_remove_device+0xae/0xf0 Aug 11 11:04:15 ato kernel: [ 109.554510] [] device_del+0x127/0x1d0 Aug 11 11:04:15 ato kernel: [ 109.554519] [] usb_disable_device+0xa8/0x130 Aug 11 11:04:15 ato kernel: [ 109.554527] [] usb_disconnect+0x95/0x130 Aug 11 11:04:15 ato kernel: [ 109.554535] [] hub_thread+0x48d/0x1210 Aug 11 11:04:15 ato kernel: [ 109.554544] [] ? dequeue_task_fair+0x8b/0x90 Aug 11 11:04:15 ato kernel: [ 109.554555] [] ? autoremove_wake_function+0x0/0x40 Aug 11 11:04:15 ato kernel: [ 109.554563] [] ? hub_thread+0x0/0x1210 Aug 11 11:04:15 ato kernel: [ 109.554571] [] kthread+0x96/0xa0 Aug 11 11:04:15 ato kernel: [ 109.554580] [] kernel_thread_helper+0x4/0x10 Aug 11 11:04:15 ato kernel: [ 109.554588] [] ? kthread+0x0/0xa0 Aug 11 11:04:15 ato kernel: [ 109.554595] [] ? 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 mii -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html