Re: [PATCH 1/3] HID: Use existing parser for pre-scanning the report descriptors

[Alexander Holler <holler@ahsoftware.de>]

Am 14.08.2013 17:38, schrieb Benjamin Tissoires:

>>>   {
>>>   	if (usage == HID_DG_CONTACTID)
>>> -		hid->group = HID_GROUP_MULTITOUCH;
>>> +		parser->flags |= HID_FLAG_MULTITOUCH;
>>
>> Did you consider reusing the group flags, e.g., parser->groups |= (1
>> << HID_GROUP_MULTITOUCH)? This change could be made regardless of the
>> parser logic.
>
> If nobody is against changing the values of the different groups across
> kernel version (which should be harmless), then I fully agree, we can
> use the group item as a bit field (but we would be able to only have 16
> different device groups).

Hmm, that might become a problem. E.g. all the HID sensors might be used 
stand alone (without a sensor-hub, if someone modifies the drivers). But 
I agree that currently the flags are just confusing and would introduce 
them only if the number of groups reaches the limit.


>>> -	hid->group = HID_GROUP_GENERIC;
>>> +	parser = vzalloc(sizeof(struct hid_parser));
>>
>> Argh, I realize it is inevitable for this patch, but it still makes my
>> eyes bleed. The parser takes quite a bit of memory...
>
> Yep, my first attempt was to remove it, then I re-added it with a small
> tear...

So you actually create a new parser and the subject (that existing) of 
this patch is misleading.

Regards,

Alexander Holler