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SubjectRe: [PATCH v12 1/4] PM / Domains: Add a generic data pointer to the genpd_power_state struct
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On 27/02/2019 20:58, Ulf Hansson wrote:
> Let's add a data pointer to the genpd_power_state struct, to allow a genpd
> backend driver to store per state specific data. To introduce the pointer,
> we need to change the way genpd deals with freeing of the corresponding
> allocated data.
>
> More precisely, let's clarify the responsibility of whom that shall free
> the data, by adding a ->free_states() callback to the struct
> generic_pm_domain. The one allocating the data shall assign the callback,
> to allow genpd to invoke it from genpd_remove().
>
> Cc: Lina Iyer <ilina@codeaurora.org>
> Co-developed-by: Lina Iyer <lina.iyer@linaro.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>
> Changes in v12:
> - None.
>
> ---
> drivers/base/power/domain.c | 12 ++++++++++--
> include/linux/pm_domain.h | 4 +++-
> 2 files changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 2c334c01fc43..03885c003c6a 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -1685,6 +1685,12 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
> }
> EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
>
> +static void genpd_free_default_power_state(struct genpd_power_state *states,
> + unsigned int state_count)
> +{
> + kfree(states);
> +}
> +
> static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
> {
> struct genpd_power_state *state;
> @@ -1695,7 +1701,7 @@ static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
>
> genpd->states = state;
> genpd->state_count = 1;
> - genpd->free = state;
> + genpd->free_states = genpd_free_default_power_state;
>
> return 0;
> }
> @@ -1811,7 +1817,9 @@ static int genpd_remove(struct generic_pm_domain *genpd)
> list_del(&genpd->gpd_list_node);
> genpd_unlock(genpd);
> cancel_work_sync(&genpd->power_off_work);
> - kfree(genpd->free);
> + if (genpd->free_states)

Is this test necessary as the free_states function is initialized with
the genpd_set_default_power_state() in any case?

> + genpd->free_states(genpd->states, genpd->state_count);
> +
> pr_debug("%s: removed %s\n", __func__, genpd->name);
>
> return 0;
> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> index 1ed5874bcee0..8e1399231753 100644
> --- a/include/linux/pm_domain.h
> +++ b/include/linux/pm_domain.h
> @@ -69,6 +69,7 @@ struct genpd_power_state {
> s64 residency_ns;
> struct fwnode_handle *fwnode;
> ktime_t idle_time;
> + void *data;
> };
>
> struct genpd_lock_ops;
> @@ -110,9 +111,10 @@ struct generic_pm_domain {
> struct device *dev);
> unsigned int flags; /* Bit field of configs for genpd */
> struct genpd_power_state *states;
> + void (*free_states)(struct genpd_power_state *states,
> + unsigned int state_count);
> unsigned int state_count; /* number of states */
> unsigned int state_idx; /* state that genpd will go to when off */
> - void *free; /* Free the state that was allocated for default */
> ktime_t on_time;
> ktime_t accounting_time;
> const struct genpd_lock_ops *lock_ops;
>


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