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SubjectRe: [RFT PATCH v2 03/10] drivers: qcom: rpmh-rsc: Fold tcs_ctrl_write() into its single caller
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Hi,

Tested-by: Maulik Shah <mkshah@codeaurora.org>

Thanks,
Maulik

On 3/12/2020 4:43 AM, Douglas Anderson wrote:
> I was trying to write documentation for the functions in rpmh-rsc and
> I got to tcs_ctrl_write(). The documentation for the function would
> have been: "This is the core of rpmh_rsc_write_ctrl_data(); all the
> caller does is error-check and then call this".
>
> Having the error checks in a separate function doesn't help for
> anything since:
> - There are no other callers that need to bypass the error checks.
> - It's less documenting. When I read tcs_ctrl_write() I kept
> wondering if I need to handle cases other than ACTIVE_ONLY or cases
> with more commands than could fit in a TCS. This is obvious when
> the error checks and code are together.
> - The function just isn't that long, so there's no problem
> understanding the combined function.
>
> Things were even more confusing because the two functions names didn't
> make obvious (at least to me) their relationship.
>
> Simplify by folding one function into the other.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Reviewed-by: Maulik Shah <mkshah@codeaurora.org>
> ---
>
> Changes in v2: None
>
> drivers/soc/qcom/rpmh-rsc.c | 39 ++++++++++++++++---------------------
> 1 file changed, 17 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
> index 02c8e0ffbbe4..799847b08038 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -550,27 +550,6 @@ static int find_slots(struct tcs_group *tcs, const struct tcs_request *msg,
> return 0;
> }
>
> -static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
> -{
> - struct tcs_group *tcs;
> - int tcs_id = 0, cmd_id = 0;
> - unsigned long flags;
> - int ret;
> -
> - tcs = get_tcs_for_msg(drv, msg);
> - if (IS_ERR(tcs))
> - return PTR_ERR(tcs);
> -
> - spin_lock_irqsave(&tcs->lock, flags);
> - /* find the TCS id and the command in the TCS to write to */
> - ret = find_slots(tcs, msg, &tcs_id, &cmd_id);
> - if (!ret)
> - __tcs_buffer_write(drv, tcs_id, cmd_id, msg);
> - spin_unlock_irqrestore(&tcs->lock, flags);
> -
> - return ret;
> -}
> -
> /**
> * rpmh_rsc_write_ctrl_data: Write request to the controller
> *
> @@ -581,6 +560,11 @@ static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
> */
> int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv, const struct tcs_request *msg)
> {
> + struct tcs_group *tcs;
> + int tcs_id = 0, cmd_id = 0;
> + unsigned long flags;
> + int ret;
> +
> if (!msg || !msg->cmds || !msg->num_cmds ||
> msg->num_cmds > MAX_RPMH_PAYLOAD) {
> pr_err("Payload error\n");
> @@ -591,7 +575,18 @@ int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv, const struct tcs_request *msg)
> if (msg->state == RPMH_ACTIVE_ONLY_STATE)
> return -EINVAL;
>
> - return tcs_ctrl_write(drv, msg);
> + tcs = get_tcs_for_msg(drv, msg);
> + if (IS_ERR(tcs))
> + return PTR_ERR(tcs);
> +
> + spin_lock_irqsave(&tcs->lock, flags);
> + /* find the TCS id and the command in the TCS to write to */
> + ret = find_slots(tcs, msg, &tcs_id, &cmd_id);
> + if (!ret)
> + __tcs_buffer_write(drv, tcs_id, cmd_id, msg);
> + spin_unlock_irqrestore(&tcs->lock, flags);
> +
> + return ret;
> }
>
> static int rpmh_probe_tcs_config(struct platform_device *pdev,

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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