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SubjectRe: [PATCH 3/4] PM / devfreq: Add devfreq_governor_start/stop()
Hi Matthias,

Looks good to me for making the function to remove the duplicate code.
But, When I just tested the kernel build, following warnings occur
about devfreq_governor_stop().

In file included from ./include/linux/devfreq.h:16:0,
from drivers/devfreq/devfreq.c:23:
drivers/devfreq/devfreq.c: In function ‘devfreq_governor_stop’:
drivers/devfreq/devfreq.c:619:17: warning: format ‘%s’ expects
argument of type ‘char *’, but argument 4 has type ‘int’ [-Wformat=]
dev_warn(dev, "%s: Governor %s not stopped: %d\n",
^
./include/linux/device.h:1380:22: note: in definition of macro ‘dev_fmt’
#define dev_fmt(fmt) fmt
^
drivers/devfreq/devfreq.c:619:3: note: in expansion of macro ‘dev_warn’
dev_warn(dev, "%s: Governor %s not stopped: %d\n",
^
drivers/devfreq/devfreq.c:619:17: warning: format ‘%d’ expects a
matching ‘int’ argument [-Wformat=]
dev_warn(dev, "%s: Governor %s not stopped: %d\n",
^
./include/linux/device.h:1380:22: note: in definition of macro ‘dev_fmt’
#define dev_fmt(fmt) fmt
^
drivers/devfreq/devfreq.c:619:3: note: in expansion of macro ‘dev_warn’
dev_warn(dev, "%s: Governor %s not stopped: %d\n",

2019년 2월 14일 (목) 오후 7:16, Matthias Kaehlcke <mka@chromium.org>님이 작성:
>
> The following pattern is repeated multiple times:
>
> - call governor event handler with DEVFREQ_GOV_START/STOP
> - check return value
> - in case of error log a message
>
> Add devfreq_governor_start/stop() helper functions with this code
> and call them instead.
>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
> ---
> drivers/devfreq/devfreq.c | 96 +++++++++++++++++++++++----------------
> 1 file changed, 58 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 7fab6c4cf719b..eb86461648d74 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -580,6 +580,53 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
> return ret;
> }
>
> +/**
> + * devfreq_governor_start() - Start the devfreq governor of the device.
> + * @devfreq: the devfreq instance
> + */
> +static int devfreq_governor_start(struct devfreq *devfreq)
> +{
> + struct device *dev = devfreq->dev.parent;
> + int err;
> +
> + if (WARN(mutex_is_locked(&devfreq->lock),
> + "mutex must *not* be held by the caller\n"))
> + return -EINVAL;
> +
> + err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START,
> + NULL);
> + if (err) {
> + dev_err(dev, "Governor %s not started: %d\n",
> + devfreq->governor->name, err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * devfreq_governor_stop() - Stop the devfreq governor of the device.
> + * @devfreq: the devfreq instance
> + */
> +static int devfreq_governor_stop(struct devfreq *devfreq)
> +{
> + struct device *dev = devfreq->dev.parent;
> + int err;
> +
> + if (WARN(mutex_is_locked(&devfreq->lock),
> + "mutex must *not* be held by the caller\n"))
> + return -EINVAL;
> +
> + err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_STOP, NULL);
> + if (err) {
> + dev_warn(dev, "%s: Governor %s not stopped: %d\n",
> + devfreq->governor->name, err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> /**
> * devfreq_dev_release() - Callback for struct device to release the device.
> * @dev: the devfreq device
> @@ -720,13 +767,9 @@ struct devfreq *devfreq_add_device(struct device *dev,
> }
>
> devfreq->governor = governor;
> - err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START,
> - NULL);
> - if (err) {
> - dev_err(dev, "%s: Unable to start governor for the device\n",
> - __func__);
> + err = devfreq_governor_start(devfreq);
> + if (err)
> goto err_init;
> - }
>
> list_add(&devfreq->node, &devfreq_list);
>
> @@ -1029,24 +1072,13 @@ int devfreq_add_governor(struct devfreq_governor *governor)
> dev_warn(dev,
> "%s: Governor %s already present\n",
> __func__, devfreq->governor->name);
> - ret = devfreq->governor->event_handler(devfreq,
> - DEVFREQ_GOV_STOP, NULL);
> - if (ret) {
> - dev_warn(dev,
> - "%s: Governor %s stop = %d\n",
> - __func__,
> - devfreq->governor->name, ret);
> - }
> + ret = devfreq_governor_stop(devfreq);
> +
> /* Fall through */
> }
> +
> devfreq->governor = governor;
> - ret = devfreq->governor->event_handler(devfreq,
> - DEVFREQ_GOV_START, NULL);
> - if (ret) {
> - dev_warn(dev, "%s: Governor %s start=%d\n",
> - __func__, devfreq->governor->name,
> - ret);
> - }
> + devfreq_governor_start(devfreq);
> }
> }
>
> @@ -1081,7 +1113,6 @@ int devfreq_remove_governor(struct devfreq_governor *governor)
> goto err_out;
> }
> list_for_each_entry(devfreq, &devfreq_list, node) {
> - int ret;
> struct device *dev = devfreq->dev.parent;
>
> if (!strncmp(devfreq->governor_name, governor->name,
> @@ -1093,13 +1124,8 @@ int devfreq_remove_governor(struct devfreq_governor *governor)
> continue;
> /* Fall through */
> }
> - ret = devfreq->governor->event_handler(devfreq,
> - DEVFREQ_GOV_STOP, NULL);
> - if (ret) {
> - dev_warn(dev, "%s: Governor %s stop=%d\n",
> - __func__, devfreq->governor->name,
> - ret);
> - }
> +
> + devfreq_governor_stop(devfreq);
> devfreq->governor = NULL;
> }
> }
> @@ -1149,19 +1175,13 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
> }
>
> if (df->governor) {
> - ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
> - if (ret) {
> - dev_warn(dev, "%s: Governor %s not stopped(%d)\n",
> - __func__, df->governor->name, ret);
> + ret = devfreq_governor_stop(df);
> + if (ret)
> goto out;
> - }
> }
> df->governor = governor;
> strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
> - ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
> - if (ret)
> - dev_warn(dev, "%s: Governor %s not started(%d)\n",
> - __func__, df->governor->name, ret);
> + ret = devfreq_governor_start(df);
> out:
> mutex_unlock(&devfreq_list_lock);
>
> --
> 2.20.1.791.gb4d0f1c61a-goog
>


--
Best Regards,
Chanwoo Choi

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