[Gta04-owner] hmc5883 crash in 3.3

[Belisko Marek]

On Wed, Apr 11, 2012 at 11:17 PM, Andreas Kemnade <andreas at kemnade.info> wrote:
> Hi,
>
>
> On Wed, 2012-04-11 at 20:57 +0200, Belisko Marek wrote:
>> Hi,
>>
>> I finally setup my gta04 and using Neil's 3.3gta04 kernel.
>> Just want to add hmc5883 support (can be used existing 5843 staging iio driver)
>> with following patch (+ enable hmc5843):
>> diff --git a/arch/arm/mach-omap2/board-omap3gta04.c
>> b/arch/arm/mach-omap2/board-omap3gta04.c
>> index c7e899c..67b46a0 100644
>> --- a/arch/arm/mach-omap2/board-omap3gta04.c
>> +++ b/arch/arm/mach-omap2/board-omap3gta04.c
>> @@ -1003,6 +1003,12 @@ static struct i2c_board_info __initdata
>> gta04_i2c2_boardinfo[] = {
>>         .type           = "bma150",
>>  },
>>  #endif
>> +#ifdef CONFIG_SENSORS_HMC5843
>> +{
>> +       I2C_BOARD_INFO("hmc5843", 0x1E),
>> +       .type           = "hmc5843",
>> +}
>> +#endif
>>         /* FIXME: add other drivers for HMC5883, BMA180, Si472x, Camera */
>>  };
>>
>
> For testing, the same can also be achieved using:
> echo hmc5843 0x1e >/sys/bus/i2c/devices/i2c-2/new_device
>
>> With change kernel gives oops during start:
>>
>> [   14.508178] bus: 'i2c': add driver hmc5843
>> [   14.512634] bus: 'i2c': driver_probe_device: matched device 2-001e
>> with driver hmc5843
>> [   14.521057] bus: 'i2c': really_probe: probing driver hmc5843 with
>> device 2-001e
>> [   14.532257] HMC5843 initialized
>> [   14.535919] device: '(null)': device_add (null)
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> This line is from added pr_info in:
>> diff --git a/drivers/base/core.c b/drivers/base/core.c
>> index 74dda4f..74cecc0 100644
>> --- a/drivers/base/core.c
>> +++ b/drivers/base/core.c
>> @@ -973,6 +973,7 @@ int device_add(struct device *dev)
>
> Hmm, looks like the pointer dev->p is somehow messed up.
>>
>> Can anybody give some light what I'm missing?
>>
> As I have tried the userspace way shown above and there is also the
> same backtracke, I guess the problem should be really in the iio driver.
I fixed a problem and send patch upstream (also to stable):
https://lkml.org/lkml/2012/4/12/370
>
> Greetings
> Andreas Kemnade
>
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> Gta04-owner at goldelico.com
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regards,

marek

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