linux-kernel - Re: [PATCH 02/18] staging: iio: hmc5843: Export missing SPI module alias information

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Message-ID: <55EB7BF9.8040902@osg.samsung.com>
Date:	Sun, 6 Sep 2015 01:34:17 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Jonathan Cameron <jic23@...nel.org>, linux-kernel@...r.kernel.org
Cc:	devel@...verdev.osuosl.org, linux-iio@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hartmut Knaack <knaack.h@....de>
Subject: Re: [PATCH 02/18] staging: iio: hmc5843: Export missing SPI module
 alias information

Hello Jonathan,

On 09/05/2015 06:31 PM, Jonathan Cameron wrote:
> On 01/09/15 00:09, Javier Martinez Canillas wrote:
>> Hello Jonathan,
>>
>> On 08/22/2015 07:59 PM, Jonathan Cameron wrote:
>>> On 20/08/15 08:07, Javier Martinez Canillas wrote:
>>>> The SPI core always reports the MODALIAS uevent as "spi:<modalias>"
>>>> regardless of the mechanism that was used to register the device
>>>> (i.e: OF or board code) and the table that is used later to match
>>>> the driver with the device (i.e: SPI id table or OF match table).
>>>>
>>>> So drivers needs to export the SPI id table and this be built into
>>>> the module or udev won't have the necessary information to autoload
>>>> the needed driver module when the device is added.
>>>>
>>>> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
>>> Applied to the togreg branch of iio.git.
>>>
>>> This is too late for the upcoming merge window so it will be queued up for
>>> the next one.
>>>
>>
>> IMHO this patch and "[PATCH 01/18] iio: Export SPI module alias
>> information in missing drivers" [0] are fixing broken module
>> autoloading which are bugs so are material for the 4.3 -rc cycle.
> 
> It's a corner case.  Could also be argued that this isn't
> a bug but rather a case of a feature (autoprobing) being added
> that wasn't supported before.  It's not obligatory to support
> autoloading (even if we would normally aim to do so).
> 
> I'm happy enough for a request to apply these to stable occurs
> after they hit Linus' tree (as a trivial backport) but I don't
> think they really deserve being sent on as fixes.
> 
> Of course, I might be missing something that means something is
> actually broken, as opposed to not present.
>

Well, as a user I would expect that if I have a driver built-in
and it works, building it as a module will also work so I think
module autoload it's a bugfix and not a new feature.

And the patch is trivial and won't cause any issues so I don't
see why it can't be -rc material.

But of course is up to you, git log shows me that these drivers
have been since v3.10 so it seems that nobody cared anyways.
 
> Jonathan
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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