BUG: warning at lib/kref.c:32/kref_get() on with 0.16.4 on 2.6.18-6-686

[Munir Nassar-2]

I have built the em8300 modules from lenny (0.16.4) on a debian etch
system, linux-2.6.18-6-686 kernel.

when i load the resulting em8300 and adv717x modules i get:

em8300: EM8300 8300 (rev 2) bus: 1, devfn: 72, irq: 11, memory: 0xe6000000.
em8300: mapped-memory at 0xf8e80000
em8300: using MTRR
em8300_main.o: Chip revision: 2
BUG: warning at lib/kref.c:32/kref_get()
 [<c01b8887>] kref_get+0x24/0x2d
 [<c01b7eee>] kobject_get+0xf/0x13
 [<c018f1f3>] sysfs_create_link+0xa2/0xf3
 [<f8b87408>] em8300_i2c_reg+0x28d/0x2c9 [em8300]
 [<c01b87e2>] kobject_uevent+0x397/0x3b9
 [<f89b60d9>] i2c_attach_client+0x62/0xd2 [i2c_core]
 [<f89fd0d8>] eeprom_detect+0xaa/0x131 [eeprom]
 [<f89b5859>] i2c_probe_address+0x8d/0x99 [i2c_core]
 [<f89b599c>] i2c_probe+0x137/0x144 [i2c_core]
 [<f89fd02e>] eeprom_detect+0x0/0x131 [eeprom]
 [<f89fd02e>] eeprom_detect+0x0/0x131 [eeprom]
 [<f89b5eaa>] i2c_add_adapter+0x161/0x191 [i2c_core]
 [<c0210ee8>] __driver_attach+0x0/0x5d
 [<f8b86a44>] em8300_probe+0x285/0x354 [em8300]
 [<c01c1c14>] pci_device_probe+0x36/0x57
 [<c0210e49>] driver_probe_device+0x42/0x8b
 [<c0210f20>] __driver_attach+0x38/0x5d
 [<c021096a>] bus_for_each_dev+0x33/0x55
 [<c0210db3>] driver_attach+0x11/0x13
 [<c0210ee8>] __driver_attach+0x0/0x5d
 [<c0210683>] bus_add_driver+0x64/0xfd
 [<c01c1d50>] __pci_register_driver+0x47/0x63
 [<f8b2d086>] em8300_init+0x86/0xb8 [em8300]
 [<c01358f9>] sys_init_module+0x16c3/0x1846
 [<c0102c11>] sysenter_past_esp+0x56/0x79


adv717x.o: ADV7170 chip detected
BUG: warning at lib/kref.c:32/kref_get()
 [<c01b8887>] kref_get+0x24/0x2d
 [<c01b7eee>] kobject_get+0xf/0x13
 [<c018f1f3>] sysfs_create_link+0xa2/0xf3
 [<f8b8724f>] em8300_i2c_reg+0xd4/0x2c9 [em8300]
 [<f89b5740>] i2c_smbus_read_byte_data+0x26/0x3c [i2c_core]
 [<f89b60d9>] i2c_attach_client+0x62/0xd2 [i2c_core]
 [<f8a6c940>] adv717x_detect+0x494/0x4bf [adv717x]
 [<c018e087>] sysfs_add_file+0x61/0x6a
 [<f8a6c978>] adv717x_attach_adapter+0xd/0x29 [adv717x]
 [<f89b5eaa>] i2c_add_adapter+0x161/0x191 [i2c_core]
 [<c0210ee8>] __driver_attach+0x0/0x5d
 [<f8b86a4b>] em8300_probe+0x28c/0x354 [em8300]
 [<c01c1c14>] pci_device_probe+0x36/0x57
 [<c0210e49>] driver_probe_device+0x42/0x8b
 [<c0210f20>] __driver_attach+0x38/0x5d
 [<c021096a>] bus_for_each_dev+0x33/0x55
 [<c0210db3>] driver_attach+0x11/0x13
 [<c0210ee8>] __driver_attach+0x0/0x5d
 [<c0210683>] bus_add_driver+0x64/0xfd
 [<c01c1d50>] __pci_register_driver+0x47/0x63
 [<f8b2d086>] em8300_init+0x86/0xb8 [em8300]
 [<c01358f9>] sys_init_module+0x16c3/0x1846
 [<c0102c11>] sysenter_past_esp+0x56/0x79


the 0.16.0 drivers in debian etch work for the most part but there is no
model file in sysfs.
i am going to try again with the default kernel from debian-lenny
(2.6.25) and report back.

Additionally unlike what is reported on
http://dxr3.sourceforge.net/howto.html#detboard this is a Creative Labs
DXR3 but uses the adv717x driver.



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[Ville Skyttä]

On Friday 22 August 2008, Munir Nassar wrote:
> I have built the em8300 modules from lenny (0.16.4) on a debian etch
> system, linux-2.6.18-6-686 kernel.
[...]
> the 0.16.0 drivers in debian etch work for the most part [...]

Just in case you weren't aware of it, the latest driver version at the moment
is 0.17.1, perhaps give it a try?

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[Munir Nassar-2]

Ville Skyttä wrote:
> On Friday 22 August 2008, Munir Nassar wrote:
>> I have built the em8300 modules from lenny (0.16.4) on a debian etch
>> system, linux-2.6.18-6-686 kernel.
> [...]
>> the 0.16.0 drivers in debian etch work for the most part [...]
>
> Just in case you weren't aware of it, the latest driver version at the moment
> is 0.17.1, perhaps give it a try?

I am aware of that, but i like to remain in the debian packaging
framework. i already checked lenny and sid and 16.4 is the latest
available.

I will try and build the 17.1 drivers on a test etch box and report back.

with the 0.16.0 drivers the em8300_ma device no longer gets created,
does anyone know how to make dxr3player work with the alsa interface?

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[Munir Nassar-2]

Ville Skyttä wrote:
> On Friday 22 August 2008, Munir Nassar wrote:
>> I have built the em8300 modules from lenny (0.16.4) on a debian etch
>> system, linux-2.6.18-6-686 kernel.
> [...]
>> the 0.16.0 drivers in debian etch work for the most part [...]
>
> Just in case you weren't aware of it, the latest driver version at the moment
> is 0.17.1, perhaps give it a try?

I just tried it and still getting the BUG: Warning at
lib/kref.c:32/kref_get()

is it possible that the newer modules do not work on older kernels?
i am going to try a kernel from lenny next.

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[Nicolas Boullis]

Hi,

On Fri, Aug 22, 2008 at 11:45:01AM -0500, Munir Nassar wrote:

> I have built the em8300 modules from lenny (0.16.4) on a debian etch
> system, linux-2.6.18-6-686 kernel.
>
> when i load the resulting em8300 and adv717x modules i get:
>
> em8300: EM8300 8300 (rev 2) bus: 1, devfn: 72, irq: 11, memory: 0xe6000000.
> em8300: mapped-memory at 0xf8e80000
> em8300: using MTRR
> em8300_main.o: Chip revision: 2
> BUG: warning at lib/kref.c:32/kref_get()
>  [<c01b8887>] kref_get+0x24/0x2d
>  [<c01b7eee>] kobject_get+0xf/0x13
>  [<c018f1f3>] sysfs_create_link+0xa2/0xf3
>  [<f8b87408>] em8300_i2c_reg+0x28d/0x2c9 [em8300]
>  [<c01b87e2>] kobject_uevent+0x397/0x3b9
>  [<f89b60d9>] i2c_attach_client+0x62/0xd2 [i2c_core]
>  [<f89fd0d8>] eeprom_detect+0xaa/0x131 [eeprom]
>  [<f89b5859>] i2c_probe_address+0x8d/0x99 [i2c_core]
>  [<f89b599c>] i2c_probe+0x137/0x144 [i2c_core]
>  [<f89fd02e>] eeprom_detect+0x0/0x131 [eeprom]
>  [<f89fd02e>] eeprom_detect+0x0/0x131 [eeprom]
>  [<f89b5eaa>] i2c_add_adapter+0x161/0x191 [i2c_core]
>  [<c0210ee8>] __driver_attach+0x0/0x5d
>  [<f8b86a44>] em8300_probe+0x285/0x354 [em8300]
>  [<c01c1c14>] pci_device_probe+0x36/0x57
>  [<c0210e49>] driver_probe_device+0x42/0x8b
>  [<c0210f20>] __driver_attach+0x38/0x5d
>  [<c021096a>] bus_for_each_dev+0x33/0x55
>  [<c0210db3>] driver_attach+0x11/0x13
>  [<c0210ee8>] __driver_attach+0x0/0x5d
>  [<c0210683>] bus_add_driver+0x64/0xfd
>  [<c01c1d50>] __pci_register_driver+0x47/0x63
>  [<f8b2d086>] em8300_init+0x86/0xb8 [em8300]
>  [<c01358f9>] sys_init_module+0x16c3/0x1846
>  [<c0102c11>] sysenter_past_esp+0x56/0x79

(snip almost the same message again)


That sounds strange, and there certainly is here a bug to investigate...
Latest versions of the em8300 drivers are meant to support "recent" 2.4
and all 2.6 releases of linux.

As far as I understand it, this only is a warning. Is there any problem
besides this horrible (and somewhat frightening) message?

As far as I understand it, the kobj for the i2c slave chip (either
EEPROM or video encoder) is not completely initialized when
em8300_i2c_reg is called. It *might* be possible to change the adv717x
and bt865 drivers, but the problem also affects the eeprom driver, which
I don't control... I can't find a simple (read "not overly complex") way
to solve this problem... :-(


> Additionally unlike what is reported on
> http://dxr3.sourceforge.net/howto.html#detboard this is a Creative Labs
> DXR3 but uses the adv717x driver.

The online docs are somewhat incomplete and outdated. Volunteers are
welcome.


Cheers,

Nicolas

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