Re: [PATCH v7 07/10] tmp, tmp_tis: Implement usage counter for locality

[Lino Sanfilippo]

On 28.07.22 10:15, Jarkko Sakkinen wrote:
> On Wed, Jul 27, 2022 at 02:16:56PM +0200, Lino Sanfilippo wrote:
>>
>>
>> On 11.07.22 04:50, Jarkko Sakkinen wrote:
>>> On Mon, Jul 04, 2022 at 07:45:12PM +0200, Lino Sanfilippo wrote:
>>>>
>>>>
>>>> On 01.07.22 01:29, Jarkko Sakkinen wrote:
>>>>
>>>>>
>>>>> I'm kind of thinking that should tpm_tis_data have a lock for its
>>>>> contents?
>>>>
>>>> Most of the tpm_tis_data structure elements are set once during init and
>>>> then never changed but only read. So no need for locking for these. The
>>>> exceptions I see are
>>>>
>>>> - flags
>>>> - locality_count
>>>> - locality
>>>
>>> I'd still go for single data struct lock, since this lock would
>>> be taken in every transmit flow. It makes the whole thing easier
>>> to maintain over time, and does not really affect scalability.
>>>
>>
>> This means switching to a complete new locking scheme which affects many
>> parts of the TIS core code. It is also not directly related to what this patch series
>> is about, namely activating the interrupts for TPM TIS.
>>
>> I suggest to first finish polishing this series especially since there have
>> only been minor issues in the last versions. Once the interrupts work we
>> still can think of implementing another lock handling in a follow up series.
>
> So what if you would use kref instead here?
>

Sure, that should not be too difficult to do. I will implement this for the next version.

Regards,
Lino