[Bug 212955] Possible kernel regression USB2 (not USB3) port EDIROL UA-101 (in USB 1.1 mode, not USB2) error -110

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=212955

--- Comment #20 from Lucas Endres (jaffa225man@gmail.com) ---
I sped through it this time with definite success:

The commit causing it was one I helped diagnose so that the UA-101's MIDI
device became available, but since I told Takashi Iwai about the issue and he
wanted me to check with you USB gurus, maybe we can help eachother in figuring
out why the snd-ua101 module doesn't work with its "Hi-SPEED" switch set to
"off" (USB1 mode) only. The snd-usb-audio module apparently did work for USB1
mode, but caused the MIDI port to be unavailable.

And, yes, its parent commit tested good
(473d5ae82d73c3b21160b725af0e247fa94d7832), and this really was tested as bad:

d763145312582c08c4e9ed99d61276cde8488256 is the first bad commit
commit d763145312582c08c4e9ed99d61276cde8488256
Author: Takashi Iwai <tiwai@suse.de>
Date:   Thu Apr 8 09:56:56 2021 +0200

    ALSA: usb-audio: Skip probe of UA-101 devices

    UA-101 device and co are supported by another driver, snd-ua101, but
    the USB audio class driver (snd-usb-audio) catches all and this
    resulted in the lack of functionality like missing MIDI devices.

    This patch introduces a sort of deny-listing for those devices to just
    return -ENODEV at probe in snd-usb-audio driver, so that it falls back
    to the probe by snd-ua101.

    BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=212477
    Link: https://lore.kernel.org/r/20210408075656.30184-1-tiwai@suse.de
    Signed-off-by: Takashi Iwai <tiwai@suse.de>

 sound/usb/card.c         |  2 ++
 sound/usb/quirks-table.h | 21 +++++++++++++++++++++
 sound/usb/usbaudio.h     |  1 +
 3 files changed, 24 insertions(+)


I think it will, but can only hope that this time, it will lead to the
solution.

Thanks!

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