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[Bug 821735] [Kernel:HEAD]usb_audio: Warning! Unlikely big volume range (=6144), cval->res is probably wrong.

https://bugzilla.novell.com/show_bug.cgi?id=821735

https://bugzilla.novell.com/show_bug.cgi?id=821735#c5


--- Comment #5 from Cristian Rodríguez <crrodriguez@xxxxxxxxxxxx> 2013-06-04
15:48:37 CLT ---
(In reply to comment #4)
Created an attachment (id=542144)
--> (http://bugzilla.novell.com/attachment.cgi?id=542144) [details]
Test fix patch

Your patch works, camera audio and video is fine, warninf is replaced by..
"set resolution quirk: cval->res = 384"

Unfortunately, I hitted another (unrelated) problem, googletalk plugin was
running when I disconnected the camera, the kernel did not like that..

[ 374.283650] ------------[ cut here ]------------
[ 374.283658] WARNING: at drivers/usb/core/urb.c:327
usb_submit_urb+0x3be/0x3d0()
[ 374.283659] URB ffff88022f6bf000 submitted while active
[ 374.283660] Modules linked in: intel_powerclamp mperf coretemp crc32_pclmul
snd_hda_codec_hdmi crc32c_intel iTCO_wdt ghash_clmulni_intel
iTCO_vendor_support snd_hda_codec_realtek aesni_intel arc4 glue_helper lrw
dell_wmi gf128mul sparse_keymap ablk_helper kvm_intel cryptd iwldvm
snd_hda_intel kvm aes_x86_64 mac80211 snd_hda_codec snd_usb_audio dell_laptop
snd_pcm dcdbas uvcvideo microcode videobuf2_core videodev iwlwifi
snd_usbmidi_lib snd_rawmidi snd_hwdep videobuf2_vmalloc videobuf2_memops
snd_timer pcspkr btusb i2c_i801 sr_mod cfg80211 bluetooth cdrom snd lpc_ich
mfd_core rfkill atl1c soundcore snd_page_alloc ac battery sg btrfs xor raid6_pq
nouveau i915 ttm drm_kms_helper drm mxm_wmi video thermal wmi i2c_algo_bit
button processor thermal_sys
[ 374.283703] CPU: 2 PID: 1420 Comm: GoogleTalkPlugi Not tainted
3.10.0-rc4-666-desktop-00036-gc66481f-dirty #28
[ 374.283705] Hardware name: Dell Inc. Dell System XPS 15Z/00WW5M,
BIOS A12 09/07/2012
[ 374.283706] 0000000000000009 ffff8801db75db70 ffffffff8146c213
ffff8801db75dba8
[ 374.283708] ffffffff810377bc ffff880231f8b800 ffff88020bfb2980
ffff8801e07ae800
[ 374.283710] ffff8802330a0408 ffff8801e07ae800 ffff8801db75dc08
ffffffff81037827
[ 374.283711] Call Trace:
[ 374.283716] [<ffffffff8146c213>] dump_stack+0x19/0x1b
[ 374.283719] [<ffffffff810377bc>] warn_slowpath_common+0x5c/0x80
[ 374.283720] [<ffffffff81037827>] warn_slowpath_fmt+0x47/0x50
[ 374.283724] [<ffffffff812da568>] ? __pm_runtime_resume+0x48/0x60
[ 374.283726] [<ffffffff8113ed27>] ? kmem_cache_alloc_trace+0x167/0x1a0
[ 374.283728] [<ffffffff81324d6e>] usb_submit_urb+0x3be/0x3d0
[ 374.283732] [<ffffffffa04e260c>] uvc_status_start+0x1c/0x20 [uvcvideo]
[ 374.283735] [<ffffffffa04dbfc9>] uvc_v4l2_open+0xc9/0x120 [uvcvideo]
[ 374.283738] [<ffffffff8115f256>] ? __inode_permission+0x26/0xc0
[ 374.283742] [<ffffffffa04af50d>] v4l2_oper+0xbd/0x110 [videodev]
[ 374.283744] [<ffffffff8115893d>] chrdev_open+0x8d/0x1d0
[ 374.283745] [<ffffffff811588b0>] ? cdev_put+0x20/0x20
[ 374.283747] [<ffffffff81152436>] do_dentry_open.isra.16+0x1d6/0x270
[ 374.283749] [<ffffffff811524e9>] finish_open+0x19/0x30
[ 374.283751] [<ffffffff811625d9>] do_last+0x4d9/0xdd0
[ 374.283753] [<ffffffff81162f7b>] path_openat+0xab/0x450
[ 374.283755] [<ffffffff8116389a>] ? user_path_at_empty+0x5a/0x90
[ 374.283757] [<ffffffff81163913>] do_filp_open+0x33/0x80
[ 374.283759] [<ffffffff8116f40f>] ? __alloc_fd+0x9f/0x130
[ 374.283761] [<ffffffff81153724>] do_sys_open+0xe4/0x1c0
[ 374.283763] [<ffffffff81153819>] SyS_open+0x19/0x20
[ 374.283765] [<ffffffff8147880b>] tracesys+0xdd/0xe2
[ 374.283767] ---[ end trace 16883b30bd022229 ]---

Is the disconnect-while-in-use scenario inherently racy ?

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