Re: [PATCH v3] bcm5974: Set BUTTONPAD property

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On 01/11/2012 11:04 AM, Henrik Rydberg wrote:
>>> Applied, however I removed stable notation as this change IMO does not
>>> qualify for the stable since it does not address a regression.
>>
>> It's not a regression per-se, but we want to fix buttonpad support, and
>> we can't do that without this patch. It's a clear bug that when the
>> property was added we did not set the property in the devices that need it.
> 
> The current behavior depends on userspace and is not a kernel bug,
> please stop the nonsense already.
> 
> For bcm5974 devices, extracting buttonpad properties has been possible
> since early 2009 (158e9287). The mechanism, predating the input
> properties interface by nearly two years, has been used in the
> multitouch and mtrack X drivers ever since. To those users, the
> present patch has no effect at all.

Just because an alternative interface has existed does not mean there
isn't a bug. A device that has a physical property, but does not set the
property bit in the driver is a real bug that needs to be fixed.
Userspace should not have to quirk around broken implementations.

It's true that userspace can quirk around things in a kernel that
predates the property bits, but where the property bits are available
the devices *must* set them or else things will break.

-- Chase
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