[pvrusb2] "failed to grab control of dtv input (code=-1)"

[Gary Buhrmaster]

(Back to what I was trying to reproduce).  I think
there may be a race in the pvrusb2 driver during
initialization which can result in the dvb side of
a hybrid device not completing initialization.

Environment: Fedora 16, 64 bit, 3.1.7 kernel, HVR-1950
How reproducable: 100% (well, 3 out of 3 test cases).
Importance: Medium (it seems to randomly occur)
Result: "failed to grab control of dtv input...."

Scenerio:

While running a perl program doing a
  while(1) { sysopen(F,"/dev/video0",O_RDWR); close(F);}
(the v4l device will be instantiated as /dev/video0),
plug in HVR-1950, and receive the following messages:

To recover and start again, kill the perl program first,
unplug the device, and then start again.


[ 2012.100657] usb 2-1.8: new high speed USB device number 9 using ehci_hcd
[ 2012.189815] usb 2-1.8: New USB device found, idVendor=2040, idProduct=7501
[ 2012.189818] usb 2-1.8: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 2012.189819] usb 2-1.8: Product: WinTV
[ 2012.189820] usb 2-1.8: Manufacturer: Hauppauge
[ 2012.189821] usb 2-1.8: SerialNumber: 7300-00-F06D46EC
[ 2012.190185] pvrusb2: Hardware description: WinTV HVR-1950 Model 751xx
[ 2013.193177] pvrusb2: Device microcontroller firmware (re)loaded; it
should now reset and reconnect.
[ 2013.236418] usb 2-1.8: USB disconnect, device number 9
[ 2013.236484] pvrusb2: Device being rendered inoperable
[ 2014.947997] usb 2-1.8: new high speed USB device number 10 using ehci_hcd
[ 2015.044277] usb 2-1.8: New USB device found, idVendor=2040, idProduct=7501
[ 2015.044280] usb 2-1.8: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 2015.044281] usb 2-1.8: Product: WinTV
[ 2015.044282] usb 2-1.8: Manufacturer: Hauppauge
[ 2015.044283] usb 2-1.8: SerialNumber: 7300-00-F06D46EC
[ 2015.045284] pvrusb2: Hardware description: WinTV HVR-1950 Model 751xx
[ 2015.076900] pvrusb2: Binding ir_rx_z8f0811_haup to i2c address 0x71.
[ 2015.076923] pvrusb2: Binding ir_tx_z8f0811_haup to i2c address 0x70.
[ 2015.080360] cx25840 18-0044: cx25843-24 found @ 0x88 (pvrusb2_a)
[ 2015.090343] pvrusb2: Attached sub-driver cx25840
[ 2015.093836] tuner 18-0042: Tuner -1 found with type(s) Radio TV.
[ 2015.093839] pvrusb2: Attached sub-driver tuner
[ 2017.248125] cx25840 18-0044: loaded v4l-cx25840.fw firmware (16382 bytes)
[ 2017.344020] tveeprom 18-00a2: Hauppauge model 75111, rev D1F5,
serial# 7161580
[ 2017.344023] tveeprom 18-00a2: MAC address is 00:0d:fe:6d:46:ec
[ 2017.344025] tveeprom 18-00a2: tuner model is NXP 18271C2 (idx 155, type 54)
[ 2017.344026] tveeprom 18-00a2: TV standards NTSC(M) ATSC/DVB Digital
(eeprom 0x88)
[ 2017.344027] tveeprom 18-00a2: audio processor is CX25843 (idx 37)
[ 2017.344029] tveeprom 18-00a2: decoder processor is CX25843 (idx 30)
[ 2017.344030] tveeprom 18-00a2: has radio, has IR receiver, has IR transmitter
[ 2017.344033] pvrusb2: Supported video standard(s) reported available
in hardware: PAL-M/N/Nc;NTSC-M/Mj/Mk;ATSC-8VSB/16VSB
[ 2017.344036] pvrusb2: Mapping standards mask=0x300b700
(PAL-M/N/Nc;NTSC-M/Mj/Mk;ATSC-8VSB/16VSB)
[ 2017.344037] pvrusb2: Setting up 6 unique standard(s)
[ 2017.344039] pvrusb2: Set up standard idx=0 name=PAL-M
[ 2017.344040] pvrusb2: Set up standard idx=1 name=PAL-N
[ 2017.344041] pvrusb2: Set up standard idx=2 name=PAL-Nc
[ 2017.344042] pvrusb2: Set up standard idx=3 name=NTSC-M
[ 2017.344043] pvrusb2: Set up standard idx=4 name=NTSC-Mj
[ 2017.344044] pvrusb2: Set up standard idx=5 name=NTSC-Mk
[ 2017.344046] pvrusb2: Initial video standard (determined by device
type): NTSC-M
[ 2017.344052] pvrusb2: Device initialization completed successfully.
[ 2017.344199] pvrusb2: registered device video0 [mpeg]
[ 2017.344201] DVB: registering new adapter (pvrusb2-dvb)
[ 2019.548234] cx25840 18-0044: loaded v4l-cx25840.fw firmware (16382 bytes)
[ 2019.656766] tda829x 18-0042: setting tuner address to 60
[ 2019.678622] tda18271 18-0060: creating new instance
[ 2019.708716] TDA18271HD/C2 detected @ 18-0060
[ 2020.526880] tda18271: performing RF tracking filter calibration
[ 2031.884937] tda18271: RF tracking filter calibration complete
[ 2031.920777] tda829x 18-0042: type set to tda8295+18271
[ 2034.450550] pvrusb2: failed to grab control of dtv input (code=-1)
[ 2034.450553] pvrusb2: unregistering DVB devices