Re: cx231xx kernel oops

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Yan Seiner <yan@xxxxxxxxxx> wrote:

>I'm resurrecting an older thread.  I have a Hauppage USB Live2
>connected 
>to a MIPS box running openWRT.  I tried this earlier on a older
>hardware 
>running the 3.0.3 kernel.  This is with newer hardware running 
>2.6.39.4.  The driver attempts to allocate 800MB (!!!) of memory for
>the 
>buffer and fails with a kernel crash.  I'm not including any kernel 
>crash stuff as it has all the symbols stripped.
>
>This seems to be the key message:
>
>[  514.770000] unable to allocate 805398992 bytes for transfer buffer 0
>
>What can I do to narrow down the allocation problem?
>
>system type        : Atheros AR9132 rev 2
>machine            : Buffalo WZR-HP-G300NH
>processor        : 0
>cpu model        : MIPS 24Kc V7.4
>BogoMIPS        : 265.42
>
>Bus 001 Device 005: ID 2040:c200 Hauppauge
>
>[   34.560000] cx231xx v4l2 driver loaded.
>[   34.570000] cx231xx #0: New device Hauppauge Hauppauge Device @ 480 
>Mbps (2040:c200) with 5 interfaces
>[   34.580000] cx231xx #0: registering interface 1
>[   34.580000] cx231xx #0: bad senario!!!!!
>[   34.590000] cx231xx #0: config_info=0
>[   34.590000] cx231xx #0: can't change interface 1 alt no. to 3: Max. 
>Pkt size = 0
>[   34.600000] usb 1-1.2: selecting invalid altsetting 3
>[   34.600000] cx231xx #0: can't change interface 1 alt no. to 3
>(err=-22)
>[   34.610000] cx231xx #0: can't change interface 1 alt no. to 1: Max. 
>Pkt size = 0
>[   34.620000] usb 1-1.2: selecting invalid altsetting 1
>[   34.620000] cx231xx #0: can't change interface 1 alt no. to 1
>(err=-22)
>[   34.630000] cx231xx #0: Identified as Hauppauge USB Live 2 (card=9)
>[   34.740000] cx231xx #0: cx231xx_dif_set_standard: setStandard to
>ffffffff
>[   34.760000] cx231xx #0: Changing the i2c master port to 3
>[   34.760000] cx25840 0-0044: cx23102 A/V decoder found @ 0x88
>(cx231xx #0)
>[   34.790000] cx25840 0-0044:  Firmware download size changed to 16 
>bytes max length
>[   36.770000] cx25840 0-0044: loaded v4l-cx231xx-avcore-01.fw firmware
>
>(16382 bytes)
>[   36.810000] cx231xx #0: cx231xx #0: v4l2 driver version 0.0.1
>[   36.840000] cx231xx #0: cx231xx_dif_set_standard: setStandard to
>ffffffff
>[   36.890000] cx231xx #0: video_mux : 0
>[   36.900000] cx231xx #0: do_mode_ctrl_overrides : 0xb000
>[   36.900000] cx231xx #0: do_mode_ctrl_overrides NTSC
>[   36.910000] cx231xx #0: cx231xx #0/0: registered device video0
>[v4l2]
>[   36.920000] cx231xx #0: cx231xx #0/0: registered device vbi0
>[   36.930000] cx231xx #0: V4L2 device registered as video0 and vbi0
>[   36.930000] cx231xx #0: EndPoint Addr 0x8f00, Alternate settings: 1
>[   36.940000] cx231xx #0: Alternate setting 0, max size= 8
>[   36.940000] cx231xx #0: EndPoint Addr 0x8f00, Alternate settings: 1
>[   36.950000] cx231xx #0: Alternate setting 0, max size= 8
>[   36.960000] cx231xx #0: EndPoint Addr 0x8f00, Alternate settings: 1
>[   36.960000] cx231xx #0: Alternate setting 0, max size= 8
>[   36.970000] cx231xx #0: EndPoint Addr 0x8f00, Alternate settings: 1
>[   36.970000] cx231xx #0: Alternate setting 0, max size= 8
>[   36.980000] usbcore: registered new interface driver cx231xx
>[   37.230000] ar71xx-wdt: enabling watchdog timer
>
>
>root@rtmovies:/www/tmp/root/etc# fswebcam -r 320x240
>--- Opening /dev/video0...
>Trying source module v4l2...
>/dev/video0 opened.
>No input was specified, using the first.
>VIDIOC_QBUF: Cannot allocate memory
>Unable to use mmap. Using read instead.
>--- Capturing frame...
>VIDIOC_DQBUF: Invalid argument
>No frames captured.
>
>
>
>-- 
>Few people are capable of expressing with equanimity opinions which
>differ from the prejudices of their social environment. Most people are
>even incapable of forming such opinions.
>    Albert Einstein
>
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800 MB for 320x420 frames? It sounds like your app has gooned its requested buffer size.

<wild speculation>
This might be due to endianess differences between MIPS abd x86 and your app only being written and tested on x86.
</wild speculation>

You still appear to USB stack problems, but not as severe (can't change device config to some bogus config).

Regards,
Andy
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