Kernel 5.2.8 - au0828 - Tuner Is Busy

[Nathan Royce]

Right up front, I must say I do NOT have a Hauppauge tuner. I think
it's like maybe Mygica/Geniatech:
Bus 002 Device 004: ID 05e1:0400 Syntek Semiconductor Co., Ltd

Whenever I update my kernel, I edit the
./drivers/media/usb/au0828/au0828-cards.c file adding an entry for my
0x400 device.
I've been doing it for years and it's been working fine... until now...

*****
Aug 16 12:07:20 computerName kernel: usb 2-2.3: Tuner is busy. Error -19
<...18 more repeated entries...>
Aug 16 12:07:20 computerName kernel: usb 2-2.3: Tuner is busy. Error -19
Aug 16 12:07:10 computerName tvheadend[3276]: main: Log started
*****
"w_scan" behaves the same way.

*****
$ modprobe au0828
Aug 16 12:52:52 computerName kernel: videodev: Linux video capture
interface: v2.00
Aug 16 12:52:52 computerName kernel: au0828: au0828_init() Debugging is enabled
Aug 16 12:52:52 computerName kernel: au0828: au0828 driver loaded
Aug 16 12:52:52 computerName kernel: au0828: au0828_usb_probe() vendor
id 0x5e1 device id 0x400 ifnum:0
Aug 16 12:52:52 computerName kernel: au0828: au0828_gpio_setup()
Aug 16 12:52:52 computerName kernel: au0828: au0828_i2c_register()
Aug 16 12:52:52 computerName kernel: au0828: i2c bus registered
Aug 16 12:52:52 computerName kernel: au0828: au0828_card_setup()
Aug 16 12:52:52 computerName kernel: tveeprom: Encountered bad packet
header [20]. Corrupt or not a Hauppauge eeprom.
Aug 16 12:52:52 computerName kernel: au0828: hauppauge_eeprom:
warning: unknown hauppauge model #0
Aug 16 12:52:52 computerName kernel: au0828: hauppauge_eeprom:
hauppauge eeprom: model=0
Aug 16 12:52:52 computerName kernel: au0828: au0828_analog_register
called for intf#0!
Aug 16 12:52:52 computerName kernel: au0828: au0828_dvb_register()
Aug 16 12:52:52 computerName kernel: au8522 7-0047: creating new instance
Aug 16 12:52:52 computerName kernel: tda18271 7-0060: creating new instance
Aug 16 12:52:52 computerName kernel: tda18271: TDA18271HD/C2 detected @ 7-0060
Aug 16 12:52:53 computerName kernel: au0828: dvb_register()
Aug 16 12:52:53 computerName kernel: dvbdev: DVB: registering new
adapter (au0828)
Aug 16 12:52:53 computerName kernel: usb 2-2.3: DVB: registering
adapter 0 frontend 0 (Auvitek AU8522 QAM/8VSB Frontend)...
Aug 16 12:52:53 computerName kernel: dvbdev: dvb_create_media_entity:
media entity 'Auvitek AU8522 QAM/8VSB Frontend' registered.
Aug 16 12:52:53 computerName kernel: dvbdev: dvb_create_media_entity:
media entity 'dvb-demux' registered.
Aug 16 12:52:53 computerName kernel: au0828: Registered device AU0828
[Hauppauge Woodbury]
Aug 16 12:52:53 computerName kernel: usbcore: registered new interface
driver au0828
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The "eeprom" thing has never been an issue with regard to my tuner
working. It still worked in spite of it.

It's odd because:
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$ lsmod | grep au0828
au0828                 86016  0
tveeprom               28672  1 au0828
dvb_core              176128  1 au0828
v4l2_common            20480  1 au0828
videobuf2_vmalloc      20480  2 dvb_core,au0828
videobuf2_v4l2         28672  1 au0828
videobuf2_common       61440  3 videobuf2_v4l2,dvb_core,au0828
videodev              253952  4
v4l2_common,videobuf2_v4l2,videobuf2_common,au0828
rc_core                61440  1 au0828
media                  61440  6
videodev,snd_usb_audio,videobuf2_v4l2,dvb_core,videobuf2_common,au0828

$ ls -la /dev/dvb/adapter0/
total 0
drwxr-xr-x  2 root root     120 Aug 16 12:01 .
drwxr-xr-x  3 root root      60 Aug 16 12:01 ..
crw-rw----+ 1 root video 212, 4 Aug 16 12:01 demux0
crw-rw----+ 1 root video 212, 5 Aug 16 12:01 dvr0
crw-rw----+ 1 root video 212, 3 Aug 16 12:01 frontend0
crw-rw----+ 1 root video 212, 7 Aug 16 12:01 net0
*****

The previous kernel version I was on that worked was 5.1.15.
I just reverted back to the previous version and it's working again.
I don't know what broke and where, between the versions.

I saw https://lkml.org/lkml/2019/1/21/1020 but this is back in January
so I don't know if something was more recently applied to au0828 that
makes use of the API.
"lsof" didn't show anything related to "/dev/dvb" being used.

Oh neat! Someone posted a neat git feature which I tried and I get:
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$ git log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset
%s %Cgreen(%cr)%Creset' --abbrev-commit --date=relative
v5.1.15..v5.2.8 drivers/media/usb/au0828/
* be50f19fee84 - media: au0828: fix null dereference in error path (12 days ago)
* c942fddf8793 - treewide: Replace GPLv2 boilerplate/reference with
SPDX - rule 157 (3 months ago)
* 16216333235a - treewide: Replace GPLv2 boilerplate/reference with
SPDX - rule 1 (3 months ago)
* ec8f24b7faaf - treewide: Add SPDX license identifier -
Makefile/Kconfig (3 months ago)
* 14340de506c9 - media: prefix header search paths with $(srctree)/ (3
months ago)
* f604f0f5afb8 - media: au0828: stop video streaming only when last
user stops (4 months ago)
* 898bc40bfcc2 - media: au0828: Fix NULL pointer dereference in
au0828_analog_stream_enable() (4 months ago)
* 383b0e5b6ebb - media: au0828: fix enable and disable source audio
and video inconsistencies (4 months ago)
* 812658d88d26 - media: change au0828 to use Media Device Allocator
API (4 months ago)
* b60a5b8dcf49 - media: Kconfig files: use the right help coding style
(5 months ago)
* f712e5358d43 - media: au0828: minor fix to a misleading comment in
_close() (5 months ago)
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Note the 812658d88d26 commit.
So if I did the git command correctly, then it WAS added between these versions.
Any thoughts on if it is broken or if I can hack in a fix to force it
to ignore it being thought as being busy?