linux-kernel - Re: [PATCH] HID: uclogic: Remove useless loop

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Date: Thu, 18 Apr 2024 20:46:09 +0200
From: Stefan Berzl <stefanberzl@...il.com>
To: Nikolai Kondrashov <spbnick@...il.com>, Jiri Kosina <jikos@...nel.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: uclogic: Remove useless loop

Hi!

On 18/04/2024 19:04, Nikolai Kondrashov wrote:
> Hi Jiri, Stefan,
> 
> On 4/18/24 4:31 PM, Stefan Berzl wrote:
>>
>> On 12/04/2024 17:52, Jiri Kosina wrote:
>>> On Mon, 1 Apr 2024, Stefan Berzl wrote:
>>>
>>>> The while in question does nothing except provide the possibility
>>>> to have an infinite loop in case the subreport id is actually the same
>>>> as the pen id.
>>>>
>>>> Signed-off-by: Stefan Berzl <stefanberzl@...il.com>
>>>
>>> Let me CC Nicolai, the author of the code of question (8b013098be2c9).
>>
>> I agree that Nicolai's opinion would be invaluable, but even without it,
>> the patch is trivially correct. If we have a subreport that matches the
>> packet, we change the report_id accordingly. If we then loop back to the
>> beginning, either the report_id is different or we are caught in an
>> infinite loop. None of these are hardware registers where the access
>> itself would matter.
> 
> Yes, Stefan is right. I was trying to implement general rewrite logic, and if
> we really had that, then the fix would need to be checking that the new ID is
> different. As such there's really no need, and Stefan's fix is fine.
> 
> Only perhaps amend that comment to something like
> 
>     /* Change to the (non-pen) subreport ID, and continue */
> 
> Or at least remove ", and restart".
> 

Will do! I'll send a v2 with the comment updated.

Regards