linux-kernel - Re: [RESEND v1] soc: qcom: pdr: Reorder the PD state indication ack

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Date:   Mon, 27 Jul 2020 23:08:57 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     rishabhb@...eaurora.org, agross@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        tsoni@...eaurora.org, sidgup@...eaurora.org, stable@...r.kernel.org
Subject: Re: [RESEND v1] soc: qcom: pdr: Reorder the PD state indication ack

On Wed 01 Jul 12:59 PDT 2020, Sibi Sankar wrote:

> The Protection Domains (PD) have a mechanism to keep its resources
> enabled until the PD down indication is acked. Reorder the PD state
> indication ack so that clients get to release the relevant resources
> before the PD goes down.
> 
> Fixes: fbe639b44a82 ("soc: qcom: Introduce Protection Domain Restart helpers")
> Reported-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
> 
> I couldn't find the previous patch on patchworks. Resending the patch
> since it would need to land on stable trees as well
> 
>  drivers/soc/qcom/pdr_interface.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/pdr_interface.c b/drivers/soc/qcom/pdr_interface.c
> index a90d707da6894..088dc99f77f3f 100644
> --- a/drivers/soc/qcom/pdr_interface.c
> +++ b/drivers/soc/qcom/pdr_interface.c
> @@ -279,13 +279,15 @@ static void pdr_indack_work(struct work_struct *work)
>  
>  	list_for_each_entry_safe(ind, tmp, &pdr->indack_list, node) {
>  		pds = ind->pds;
> -		pdr_send_indack_msg(pdr, pds, ind->transaction_id);
>  
>  		mutex_lock(&pdr->status_lock);
>  		pds->state = ind->curr_state;
>  		pdr->status(pds->state, pds->service_path, pdr->priv);
>  		mutex_unlock(&pdr->status_lock);
>  
> +		/* Ack the indication after clients release the PD resources */
> +		pdr_send_indack_msg(pdr, pds, ind->transaction_id);
> +
>  		mutex_lock(&pdr->list_lock);
>  		list_del(&ind->node);
>  		mutex_unlock(&pdr->list_lock);
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>