[alsa-devel] [PATCH 0/6] snd-usb endpoint rework, version 6

[Grant Diffey]

So I've had a chance to do some testing. I can reliably generate then
following trace with daniels patch on 3.2-rt10

[  188.561901] ------------[ cut here ]------------
[  188.561908] WARNING: at fs/proc/generic.c:586 proc_register+0x181/0x1c7()
[  188.561909] Hardware name: HP Compaq 6910p
[  188.561911] proc_dir_entry 'card1/pcm0p' already registered
[  188.561912] Modules linked in: snd_usb_audio snd_usbmidi_lib
snd_seq_dummy acpi_cpufreq mperf cpufreq_userspace cpufreq_stats
cpufreq_conservative cpufreq_powersave ppdev lp parport microcode
binfmt_misc uinput fuse nfsd exportfs nfs lockd fscache auth_rpcgss nfs_acl
sunrpc ext2 firewire_sbp2 loop btusb bluetooth snd_hda_codec_analog arc4
iwl4965 iwl_legacy i915 mac80211 uhci_hcd snd_hda_intel snd_hda_codec
ehci_hcd drm_kms_helper snd_hwdep drm snd_pcm_oss snd_mixer_oss snd_pcm
snd_seq_midi cfg80211 snd_rawmidi snd_seq_midi_event snd_seq usbcore sr_mod
mmc_block snd_timer tpm_infineon pata_pcmcia snd_seq_device firewire_ohci
snd sdhci_pci i2c_algo_bit irda cdrom sdhci joydev pcmcia tpm_tis
ata_generic ata_piix hp_wmi firewire_core i2c_core yenta_socket pcmcia_rsrc
iTCO_wdt mmc_core battery pcmcia_core sparse_keymap ac power_supply rfkill
pcspkr soundcore tpm tpm_bios wmi iTCO_vendor_support evdev crc_itu_t
crc_ccitt psmouse processor container video usb_common snd_page_alloc
serio_raw button ext3 jbd mbcache sha256_generic aes_x86_64 aes_generic cbc
dm_crypt dm_mod sd_mod crc_t10dif ahci libahci libata scsi_mod fan thermal
thermal_sys
[  188.561979] Pid: 621, comm: khubd Not tainted 3.2.0-rt10-00255-g530565d
#5
[  188.561980] Call Trace:
[  188.561986]  [<ffffffff81036273>] ? warn_slowpath_common+0x78/0x8c
[  188.561989]  [<ffffffff8103631f>] ? warn_slowpath_fmt+0x45/0x4a
[  188.561993]  [<ffffffff8102df06>] ? get_parent_ip+0x9/0x1b
[  188.561995]  [<ffffffff81123ac5>] ? proc_register+0x181/0x1c7
[  188.561997]  [<ffffffff81123e2c>] ? create_proc_entry+0x6e/0x85
[  188.562020]  [<ffffffffa0237c18>] ? snd_info_register+0x35/0xbd [snd]
[  188.562026]  [<ffffffffa02cdf89>] ? snd_pcm_new_stream+0xd6/0x417
[snd_pcm]
[  188.562031]  [<ffffffffa05b69e3>] ? snd_usb_add_audio_stream+0xd5/0x21c
[snd_usb_audio]
[  188.562035]  [<ffffffffa05b6fd3>] ?
snd_usb_parse_audio_interface+0x4a9/0x556 [snd_usb_audio]
[  188.562039]  [<ffffffffa05ae276>] ? snd_usb_create_stream+0xed/0x126
[snd_usb_audio]
[  188.562043]  [<ffffffffa05aea74>] ? usb_audio_probe+0x61d/0x72d
[snd_usb_audio]
[  188.562057]  [<ffffffffa028c6e3>] ? usb_probe_interface+0xf8/0x163
[usbcore]
[  188.562062]  [<ffffffff812170f1>] ? driver_probe_device+0xa8/0x138
[  188.562064]  [<ffffffff812171f0>] ? __driver_attach+0x6f/0x6f
[  188.562066]  [<ffffffff81216120>] ? bus_for_each_drv+0x4a/0x7e
[  188.562069]  [<ffffffff81217012>] ? device_attach+0x6f/0x8f
[  188.562071]  [<ffffffff8121692c>] ? bus_probe_device+0x1f/0x37
[  188.562073]  [<ffffffff8121520a>] ? device_add+0x3d4/0x577
[  188.562076]  [<ffffffff8102df06>] ? get_parent_ip+0x9/0x1b
[  188.562078]  [<ffffffff81030bf0>] ? migrate_enable+0x150/0x16a
[  188.562085]  [<ffffffffa028b2b0>] ? usb_set_configuration+0x53f/0x594
[usbcore]
[  188.562088]  [<ffffffff811304e6>] ? sysfs_do_create_link+0x149/0x194
[  188.562094]  [<ffffffffa029231a>] ? generic_probe+0x45/0x73 [usbcore]
[  188.562097]  [<ffffffff812170f1>] ? driver_probe_device+0xa8/0x138
[  188.562099]  [<ffffffff812171f0>] ? __driver_attach+0x6f/0x6f
[  188.562101]  [<ffffffff81216120>] ? bus_for_each_drv+0x4a/0x7e
[  188.562104]  [<ffffffff81217012>] ? device_attach+0x6f/0x8f
[  188.562106]  [<ffffffff8121692c>] ? bus_probe_device+0x1f/0x37
[  188.562108]  [<ffffffff8121520a>] ? device_add+0x3d4/0x577
[  188.562110]  [<ffffffff81214793>] ? dev_printk+0x48/0x4d
[  188.562116]  [<ffffffffa0285188>] ? usb_new_device+0x124/0x198 [usbcore]
[  188.562122]  [<ffffffffa02861eb>] ? hub_thread+0x964/0xe54 [usbcore]
[  188.562124]  [<ffffffff8102abf4>] ? hrtick_start_fair+0x1a/0x15b
[  188.562127]  [<ffffffff8102000a>] ? kern_addr_valid+0x5/0x93
[  188.562131]  [<ffffffff8131adb9>] ? __schedule+0x531/0x548
[  188.562135]  [<ffffffff8104ff82>] ? __init_waitqueue_head+0x39/0x39
[  188.562140]  [<ffffffffa0285887>] ? usb_remote_wakeup+0x2f/0x2f [usbcore]
[  188.562142]  [<ffffffff8104f8b8>] ? kthread+0x78/0x80
[  188.562145]  [<ffffffff8102df06>] ? get_parent_ip+0x9/0x1b
[  188.562148]  [<ffffffff81310000>] ? init_amd+0x112/0x3e4
[  188.562151]  [<ffffffff81322d74>] ? kernel_thread_helper+0x4/0x10
[  188.562154]  [<ffffffff8104f840>] ? __init_kthread_worker+0x41/0x41
[  188.562156]  [<ffffffff81322d70>] ? gs_change+0x13/0x13
[  188.562161] ---[ end trace 0000000000000002 ]---


Grant