Re: [PATCH 6/7] remoteproc: qcom_q6v5_pas: Add hwspinlock bust on stop

Chris Lew
2024-05-17T17:20:38Z

On 5/17/2024 2:08 AM, Bryan O'Donoghue wrote:
> On 17/05/2024 00:58, Chris Lew wrote:
>> From: Richard Maina <quic_rmaina@quicinc.com>
>>
>> When remoteproc goes down unexpectedly this results in a state where any
>> acquired hwspinlocks will remain locked possibly resulting in deadlock.
>> In order to ensure all locks are freed we include a call to
>> hwspin_lock_bust() during remoteproc shutdown.
>>
>> For qcom_q6v5_pas remoteprocs, each remoteproc has an assigned id that
>> is used to take the hwspinlock. Remoteproc should use this id to try and
>> bust the lock on remoteproc stop.
>>
>> This edge case only occurs with q6v5_pas watchdog crashes. The error
>> fatal case has handling to clear the hwspinlock before the error fatal
>> interrupt is triggered.
>>
>> Signed-off-by: Richard Maina <quic_rmaina@quicinc.com>
>> Signed-off-by: Chris Lew <quic_clew@quicinc.com>
>> ---
>
>> +    if (adsp->hwlock) {
>> +        ret = hwspin_lock_bust(adsp->hwlock, adsp->hwlock_id);
>> +        if (ret)
>> +            dev_info(adsp->dev, "failed to bust hwspinlock\n");
>
> qcom_hwspinlock_bust() already prints an error on failure, you're
> printing a second error here.
>
> Choose at most one.
>

Ack, will remove the error print here and leave the one in
qcom_hwspinlock_bust()

> ---
> bod