linux-kernel - Re: [PATCH] iio: core: Propagate error codes from OF layer to client drivers

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Message-ID: <53FE183D.4020403@kernel.org>
Date:	Wed, 27 Aug 2014 18:41:17 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Adam Thomson <Adam.Thomson@...semi.com>,
	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>,
	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Guenter Roeck <linux@...ck-us.net>
CC:	"knaack.h@....de" <knaack.h@....de>,
	"lars@...afoo.de" <lars@...afoo.de>,
	"pmeerw@...erw.net" <pmeerw@...erw.net>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: core: Propagate error codes from OF layer to client
 drivers

On 27/08/14 16:59, Adam Thomson wrote:
> On August 26, 2014 15:36, Adam Thomson wrote:
> 
>> On August 26, 2014 14:48, Ivan T. Ivanov wrote:
>>
>>> On Tue, 2014-08-26 at 06:25 -0700, Guenter Roeck wrote:
>>>> On 08/26/2014 12:51 AM, Ivan T. Ivanov wrote:
>>>>> Hi,
>>>>>
>>>> [ ... ]
>>>>>
>>>>> Another, less intrusive, solution will be if we revert last patch and explicitly
>>>>> check for EPROBE_DEFER on of_ by_name() return. How this sounds?
>>>>>
>>>> How is that different to the just accepted patch ?
>>>
>>> You mean this one[1]. I have prepared fix last Friday and forget to
>>> check again before posting it, sorry. Please ignore my patch.
>>>
>>> Thanks,
>>> Ivan
>>>
>>> [1] iio:inkern: fix overwritten -EPROBE_DEFER in of_iio_channel_get_by_name
>>>
>>
>> Apologies on my part for fixing one problem and introducing another. Didn't see
>> that in my testing, and missed that potential return value when examining the
>> code. At the time It looked like the parent function would only expect NULL
>> pointers for failure, especially given the non CONFIG_OF definitions of the
>> functions. Should've delved further. :(
> 
> On August 26, 2014 15:36, Adam Thomson wrote:
> 
>> On August 26, 2014 14:48, Ivan T. Ivanov wrote:
>>
>>> On Tue, 2014-08-26 at 06:25 -0700, Guenter Roeck wrote:
>>>> On 08/26/2014 12:51 AM, Ivan T. Ivanov wrote:
>>>>> Hi,
>>>>>
>>>> [ ... ]
>>>>>
>>>>> Another, less intrusive, solution will be if we revert last patch and explicitly
>>>>> check for EPROBE_DEFER on of_ by_name() return. How this sounds?
>>>>>
>>>> How is that different to the just accepted patch ?
>>>
>>> You mean this one[1]. I have prepared fix last Friday and forget to
>>> check again before posting it, sorry. Please ignore my patch.
>>>
>>> Thanks,
>>> Ivan
>>>
>>> [1] iio:inkern: fix overwritten -EPROBE_DEFER in of_iio_channel_get_by_name
>>>
>>
>> Apologies on my part for fixing one problem and introducing another. Didn't see
>> that in my testing, and missed that potential return value when examining the
>> code. At the time It looked like the parent function would only expect NULL
>> pointers for failure, especially given the non CONFIG_OF definitions of the
>> functions. Should've delved further. :(
> 
> In testing patch code for one of our devices, I've verified what Guenter
> mentioned previously in this thread, in that iio_channel_get_sys() doesn't
> return -EPROBE_DEFER. This means that drivers using the default map approach of
> accessing IIO channels will fail to instantiate as they do not know they
> need to defer their probe (have seen this with my driver too).
> 
> Haven't looked in detail yet as to how, but I guess this is something that will
> also need to be addressed.
Yes, that stuff (I think) predates deferred probing and no one has gotten around
to bringing it up to date as yet.

All contributions welcome!

J

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