Quoting Raju P.L.S.S.S.N (2019-02-21 04:18:26)
> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
> index d6b834eeeb37..9cc303e88a06 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -524,6 +524,30 @@ static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
> return ret;
> }
>
> +/**
> + * rpmh_rsc_ctrlr_is_idle: Check if any of the AMCs are busy.
> + *
> + * @drv: The controller
> + *
> + * Returns true if the TCSes are engaged in handling requests.
> + */
> +bool rpmh_rsc_ctrlr_is_idle(struct rsc_drv *drv)
> +{
This API seems inherently racy. How do we know that nothing else is
going to be inserted into the TCS after this function returns true? Do
you have a user of this API? It would be good to know how it is used
instead of adding some code that never gets called.
> + int m;
> + struct tcs_group *tcs = get_tcs_of_type(drv, ACTIVE_TCS);
> +
> + spin_lock(&drv->lock);
> + for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++) {
> + if (!tcs_is_free(drv, m)) {
> + spin_unlock(&drv->lock);
> + return false;
> + }
> + }
> + spin_unlock(&drv->lock);
> +
> + return true;
> +}
> +
> /**
> * rpmh_rsc_write_ctrl_data: Write request to the controller
> *
