linux-kernel - kobject_add failed for card0, ALSA and USB

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Date:	Wed, 27 Dec 2006 21:28:19 -0500
From:	"Jon Smirl" <jonsmirl@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>
Subject: kobject_add failed for card0, ALSA and USB

Something has stopped working between usb_audio and ALSA. When I boot
my USB audio won't work, but if I remove it and plug it in again it
works. I posted this on usb-dev and alsa-dev but everyone is gone.

The error occurs when the device is plugged in a again.

usb 2-1: new full speed USB device using uhci_hcd and address 3
usb 2-1: configuration #1 chosen from 1 choice
ALSA sound/usb/usbaudio.c:2739: 3:1:1: add audio endpoint 0x1
ALSA sound/usb/usbaudio.c:2739: 3:2:1: add audio endpoint 0x82
ALSA sound/usb/usbmixer.c:989: [2] FU [PCM Playback Switch] ch = 1, val = 0/1/1
ALSA sound/usb/usbmixer.c:989: [2] FU [PCM Playback Volume] ch = 6,
val = 0/32512/127
ALSA sound/usb/usbmixer.c:989: [5] FU [PCM Capture Switch] ch = 1, val = 0/1/1
ALSA sound/usb/usbmixer.c:989: [5] FU [PCM Capture Volume] ch = 2, val
= 0/6144/768
kobject_add failed for card0 with -EEXIST, don't try to register
things with the same name in the same directory.
 [<c01be26f>] kobject_add+0x10f/0x190
 [<c020b0c7>] device_add+0xb7/0x530
 [<c01bdf3f>] kobject_get+0xf/0x20
 [<c01be34b>] kobject_init+0x2b/0x40
 [<c020b5d8>] device_create+0x88/0xc0
 [<f8a6cc47>] snd_card_register+0x2e7/0x3c0 [snd]
 [<f8865c74>] usb_driver_claim_interface+0x84/0xb0 [usbcore]
 [<f8a875bc>] usb_audio_probe+0x5dc/0xa30 [snd_usb_audio]
 [<c01257e7>] try_to_del_timer_sync+0x47/0x50
 [<f8865b06>] usb_probe_interface+0x96/0xe0 [usbcore]
 [<c020d204>] really_probe+0x54/0x140
 [<c020d339>] driver_probe_device+0x49/0xc0
 [<c02af7e3>] klist_next+0x53/0xa0
 [<c020c614>] bus_for_each_drv+0x44/0x70
 [<c020d44a>] device_attach+0x7a/0x80
 [<c020d3b0>] __device_attach+0x0/0x10
 [<c020c556>] bus_attach_device+0x26/0x60
 [<c020b465>] device_add+0x455/0x530
 [<f8863e71>] usb_set_configuration+0x3f1/0x4d0 [usbcore]
 [<f886b867>] generic_probe+0x157/0x210 [usbcore]
 [<f8865753>] usb_probe_device+0x33/0x40 [usbcore]
 [<c020d204>] really_probe+0x54/0x140
 [<c020d339>] driver_probe_device+0x49/0xc0
 [<c02af7e3>] klist_next+0x53/0xa0
 [<c020c614>] bus_for_each_drv+0x44/0x70
 [<c020d44a>] device_attach+0x7a/0x80
 [<c020d3b0>] __device_attach+0x0/0x10
 [<c020c556>] bus_attach_device+0x26/0x60
 [<c020b465>] device_add+0x455/0x530
 [<f885f422>] __usb_new_device+0x92/0x120 [usbcore]
 [<f88607db>] hub_thread+0x74b/0xc10 [usbcore]
 [<c012f530>] autoremove_wake_function+0x0/0x50
 [<f8860090>] hub_thread+0x0/0xc10 [usbcore]
 [<c012f37a>] kthread+0xba/0xf0
 [<c012f2c0>] kthread+0x0/0xf0
 [<c0103cab>] kernel_thread_helper+0x7/0x1c
 =======================
input: Philips Electronics Philips PSC805 as /class/input/input6
input,hiddev96: USB HID v1.00 Device [Philips Electronics Philips
PSC805] on usb-0000:00:1d.1-1
ALSA sound/usb/usbaudio.c:1317: setting usb interface 1:1
ALSA sound/usb/usbaudio.c:1317: setting usb interface 1:1


-- 
Jon Smirl
jonsmirl@...il.com
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