Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the power_supply_class structure to be declared at build
time placing it into read-only memory, instead of having to be dynamically
allocated at boot time.
Cc: Greg Kroah-Hartman <[email protected]>
Suggested-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Ricardo B. Marliere <[email protected]>
---
drivers/power/supply/ab8500_btemp.c | 2 +-
drivers/power/supply/ab8500_chargalg.c | 2 +-
drivers/power/supply/ab8500_charger.c | 2 +-
drivers/power/supply/ab8500_fg.c | 2 +-
drivers/power/supply/apm_power.c | 2 +-
drivers/power/supply/power_supply_core.c | 40 ++++++++++++++++++--------------
include/linux/power_supply.h | 2 +-
7 files changed, 28 insertions(+), 24 deletions(-)
diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index 7905eba93dea..41dba40fffdf 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -617,7 +617,7 @@ static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
*/
static void ab8500_btemp_external_power_changed(struct power_supply *psy)
{
- class_for_each_device(power_supply_class, NULL, psy,
+ class_for_each_device(&power_supply_class, NULL, psy,
ab8500_btemp_get_ext_psy_data);
}
diff --git a/drivers/power/supply/ab8500_chargalg.c b/drivers/power/supply/ab8500_chargalg.c
index de912658facb..329ae784a72d 100644
--- a/drivers/power/supply/ab8500_chargalg.c
+++ b/drivers/power/supply/ab8500_chargalg.c
@@ -1231,7 +1231,7 @@ static void ab8500_chargalg_algorithm(struct ab8500_chargalg *di)
int ret;
/* Collect data from all power_supply class devices */
- class_for_each_device(power_supply_class, NULL,
+ class_for_each_device(&power_supply_class, NULL,
di->chargalg_psy, ab8500_chargalg_get_ext_psy_data);
ab8500_chargalg_end_of_charge(di);
diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index d72f32c663bc..1c2b69bbed17 100644
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -1949,7 +1949,7 @@ static void ab8500_charger_check_vbat_work(struct work_struct *work)
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, check_vbat_work.work);
- class_for_each_device(power_supply_class, NULL,
+ class_for_each_device(&power_supply_class, NULL,
&di->usb_chg, ab8500_charger_get_ext_psy_data);
/* First run old_vbat is 0. */
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index 8c593fbdd45a..e49e704023e1 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -2407,7 +2407,7 @@ static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
*/
static void ab8500_fg_external_power_changed(struct power_supply *psy)
{
- class_for_each_device(power_supply_class, NULL, psy,
+ class_for_each_device(&power_supply_class, NULL, psy,
ab8500_fg_get_ext_psy_data);
}
diff --git a/drivers/power/supply/apm_power.c b/drivers/power/supply/apm_power.c
index 9d1a7fbcaed4..034f28699977 100644
--- a/drivers/power/supply/apm_power.c
+++ b/drivers/power/supply/apm_power.c
@@ -79,7 +79,7 @@ static void find_main_battery(void)
main_battery = NULL;
bp.main = main_battery;
- error = class_for_each_device(power_supply_class, NULL, &bp,
+ error = class_for_each_device(&power_supply_class, NULL, &bp,
__find_main_battery);
if (error) {
main_battery = bp.main;
diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 37dac7669090..18232c562a98 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -26,7 +26,10 @@
#include "samsung-sdi-battery.h"
/* exported for the APM Power driver, APM emulation */
-struct class *power_supply_class;
+const struct class power_supply_class = {
+ .name = "power_supply",
+ .dev_uevent = power_supply_uevent,
+};
EXPORT_SYMBOL_GPL(power_supply_class);
static BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
@@ -97,7 +100,7 @@ static void power_supply_changed_work(struct work_struct *work)
if (likely(psy->changed)) {
psy->changed = false;
spin_unlock_irqrestore(&psy->changed_lock, flags);
- class_for_each_device(power_supply_class, NULL, psy,
+ class_for_each_device(&power_supply_class, NULL, psy,
__power_supply_changed_work);
power_supply_update_leds(psy);
blocking_notifier_call_chain(&power_supply_notifier,
@@ -191,7 +194,7 @@ static int power_supply_populate_supplied_from(struct power_supply *psy)
{
int error;
- error = class_for_each_device(power_supply_class, NULL, psy,
+ error = class_for_each_device(&power_supply_class, NULL, psy,
__power_supply_populate_supplied_from);
dev_dbg(&psy->dev, "%s %d\n", __func__, error);
@@ -226,8 +229,8 @@ static int power_supply_find_supply_from_node(struct device_node *supply_node)
* We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
* it returned 0, or error as returned by it.
*/
- error = class_for_each_device(power_supply_class, NULL, supply_node,
- __power_supply_find_supply_from_node);
+ error = class_for_each_device(&power_supply_class, NULL, supply_node,
+ __power_supply_find_supply_from_node);
return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
}
@@ -333,7 +336,7 @@ int power_supply_am_i_supplied(struct power_supply *psy)
struct psy_am_i_supplied_data data = { psy, 0 };
int error;
- error = class_for_each_device(power_supply_class, NULL, &data,
+ error = class_for_each_device(&power_supply_class, NULL, &data,
__power_supply_am_i_supplied);
dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
@@ -369,7 +372,7 @@ int power_supply_is_system_supplied(void)
int error;
unsigned int count = 0;
- error = class_for_each_device(power_supply_class, NULL, &count,
+ error = class_for_each_device(&power_supply_class, NULL, &count,
__power_supply_is_system_supplied);
/*
@@ -416,7 +419,7 @@ int power_supply_get_property_from_supplier(struct power_supply *psy,
* This function is not intended for use with a supply with multiple
* suppliers, we simply pick the first supply to report the psp.
*/
- ret = class_for_each_device(power_supply_class, NULL, &data,
+ ret = class_for_each_device(&power_supply_class, NULL, &data,
__power_supply_get_supplier_property);
if (ret < 0)
return ret;
@@ -462,8 +465,8 @@ static int power_supply_match_device_by_name(struct device *dev, const void *dat
struct power_supply *power_supply_get_by_name(const char *name)
{
struct power_supply *psy = NULL;
- struct device *dev = class_find_device(power_supply_class, NULL, name,
- power_supply_match_device_by_name);
+ struct device *dev = class_find_device(&power_supply_class, NULL, name,
+ power_supply_match_device_by_name);
if (dev) {
psy = dev_get_drvdata(dev);
@@ -519,8 +522,8 @@ struct power_supply *power_supply_get_by_phandle(struct device_node *np,
if (!power_supply_np)
return ERR_PTR(-ENODEV);
- dev = class_find_device(power_supply_class, NULL, power_supply_np,
- power_supply_match_device_node);
+ dev = class_find_device(&power_supply_class, NULL, power_supply_np,
+ power_supply_match_device_node);
of_node_put(power_supply_np);
@@ -1373,7 +1376,7 @@ __power_supply_register(struct device *parent,
device_initialize(dev);
- dev->class = power_supply_class;
+ dev->class = &power_supply_class;
dev->type = &power_supply_dev_type;
dev->parent = parent;
dev->release = power_supply_dev_release;
@@ -1621,12 +1624,13 @@ EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
static int __init power_supply_class_init(void)
{
- power_supply_class = class_create("power_supply");
+ int err;
- if (IS_ERR(power_supply_class))
- return PTR_ERR(power_supply_class);
+ err = class_register(&power_supply_class);
+
+ if (err)
+ return err;
- power_supply_class->dev_uevent = power_supply_uevent;
power_supply_init_attrs();
return 0;
@@ -1634,7 +1638,7 @@ static int __init power_supply_class_init(void)
static void __exit power_supply_class_exit(void)
{
- class_destroy(power_supply_class);
+ class_unregister(&power_supply_class);
}
subsys_initcall(power_supply_class_init);
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index c0992a77feea..514f652de64d 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -895,7 +895,7 @@ extern int power_supply_powers(struct power_supply *psy, struct device *dev);
extern void *power_supply_get_drvdata(struct power_supply *psy);
/* For APM emulation, think legacy userspace. */
-extern struct class *power_supply_class;
+extern const struct class power_supply_class;
static inline bool power_supply_is_amp_property(enum power_supply_property psp)
{
---
base-commit: 9a451f1b028e116d037a93bf13eb8f8620994205
change-id: 20240301-class_cleanup-power-ac7b0b2660b6
Best regards,
--
Ricardo B. Marliere <[email protected]>
On Fri, Mar 1, 2024 at 6:46 PM Ricardo B. Marliere <[email protected]> wrote:
> Since commit 43a7206b0963 ("driver core: class: make class_register() take
> a const *"), the driver core allows for struct class to be in read-only
> memory, so move the power_supply_class structure to be declared at build
> time placing it into read-only memory, instead of having to be dynamically
> allocated at boot time.
>
> Cc: Greg Kroah-Hartman <[email protected]>
> Suggested-by: Greg Kroah-Hartman <[email protected]>
> Signed-off-by: Ricardo B. Marliere <[email protected]>
Looks good!
Reviewed-by: Linus Walleij <[email protected]>
Yours,
Linus Walleij
On Fri, 01 Mar 2024 14:46:15 -0300, Ricardo B. Marliere wrote:
> Since commit 43a7206b0963 ("driver core: class: make class_register() take
> a const *"), the driver core allows for struct class to be in read-only
> memory, so move the power_supply_class structure to be declared at build
> time placing it into read-only memory, instead of having to be dynamically
> allocated at boot time.
>
>
> [...]
Applied, thanks!
[1/1] power: supply: core: make power_supply_class constant
commit: 71c2cc5cbf686c2397f43cbcb51a31589bdcee7b
Best regards,
--
Sebastian Reichel <[email protected]>