linux-kernel - Re: [PATCH] soc: qcom: rpmh: Use __fill_rpmh_msg API during rpmh

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Message-ID: <31fe6700-b7ea-6d57-0e83-75bcfb118c08@codeaurora.org>
Date:   Mon, 22 Jun 2020 15:03:24 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        bjorn.andersson@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dianders@...omium.org, rnayak@...eaurora.org, ilina@...eaurora.org,
        lsrao@...eaurora.org
Subject: Re: [PATCH] soc: qcom: rpmh: Use __fill_rpmh_msg API during
 rpmh_write()

Hi,

On 6/19/2020 1:53 PM, Stephen Boyd wrote:
> Quoting Maulik Shah (2020-06-18 06:14:11)
>> Use __fill_rpmh_msg API during rpmh_write(). This allows to
>> remove duplication of code in error checking, copying commands
>> and setting message state.
>>
>> Signed-off-by: Maulik Shah<mkshah@...eaurora.org>
>> ---
>>   drivers/soc/qcom/rpmh.c | 12 +++---------
>>   1 file changed, 3 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
>> index f2b5b46c..a0a0b97 100644
>> --- a/drivers/soc/qcom/rpmh.c
>> +++ b/drivers/soc/qcom/rpmh.c
>> @@ -181,8 +181,6 @@ static int __rpmh_write(const struct device *dev, enum rpmh_state state,
>>          struct cache_req *req;
>>          int i;
>>   
>> -       rpm_msg->msg.state = state;
>> -
>>          /* Cache the request in our store and link the payload */
>>          for (i = 0; i < rpm_msg->msg.num_cmds; i++) {
>>                  req = cache_rpm_request(ctrlr, state, &rpm_msg->msg.cmds[i]);
>> @@ -190,8 +188,6 @@ static int __rpmh_write(const struct device *dev, enum rpmh_state state,
>>                          return PTR_ERR(req);
>>          }
>>   
>> -       rpm_msg->msg.state = state;
>> -
>>          if (state == RPMH_ACTIVE_ONLY_STATE) {
>>                  WARN_ON(irqs_disabled());
>>                  ret = rpmh_rsc_send_data(ctrlr_to_drv(ctrlr), &rpm_msg->msg);
> Were these two hunks just nonsense assignments to rpm_msg->msg.state?

yes, using  __fill_rpmh_msg() and DEFINE_RPMH_MSG_ONSTACK takes care of 
setting this.

Thanks,
Maulik

>
>> @@ -268,11 +264,9 @@ int rpmh_write(const struct device *dev, enum rpmh_state state,
>>          DEFINE_RPMH_MSG_ONSTACK(dev, state, &compl, rpm_msg);
>>          int ret;
>>   
>> -       if (!cmd || !n || n > MAX_RPMH_PAYLOAD)
>> -               return -EINVAL;
>> -
>> -       memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd));
>> -       rpm_msg.msg.num_cmds = n;
>> +       ret = __fill_rpmh_msg(&rpm_msg, state, cmd, n);
>> +       if (ret)
>> +               return ret;
> This part makes sense and is discussed in the commit text.

-- 
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