linux-kernel - Re: [PATCH v2 09/11] mfd: twl-core: Collect global variables behind one private structure (global)

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Date:	Mon, 11 Feb 2013 14:22:25 -0600
From:	Jon Hunter <jon-hunter@...com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH v2 09/11] mfd: twl-core: Collect global variables behind
 one private structure (global)


On 02/08/2013 11:50 PM, Peter Ujfalusi wrote:
> On 02/08/2013 07:56 PM, Jon Hunter wrote:
>>>  /**
>>>   * twl_i2c_write - Writes a n bit register in TWL4030/TWL5030/TWL60X0
>>>   * @mod_no: module number
>>> @@ -322,16 +323,17 @@ int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
>>>  		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
>>>  		return -EPERM;
>>>  	}
>>> -	if (unlikely(!inuse)) {
>>> +	if (unlikely(!twl_priv->ready)) {
>>
>> This is causing the kernel to panic on all my omap2 boards when booting linux-next
>> because twl_priv is not initialised yet.
> 
> Good catch.
> I just wonder from where the twl_* call is coming on OMAP2. AFAIK the twl code
> is for OMAP3/4, for OMAP2 Menelaus is the one which is used.
> I'm currently working on to remove all those twl_* calls from random places in
> the kernel so we will only access twl via the MFD stack.

Good point. I just noticed that none of my omap2+ board were booting and
on omap3/4 I was the panic in the twl code. I can't say that I checked
the panic on omap2, so may be that was another problem?

I will update the changelog and re-send the patch.

Cheers
Jon
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