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gpio: aggregator: stop using dev-sync-probe

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dev-err-probe is an overengineered solution to a simple problem. Use a
combination of wait_for_probe() and device_is_bound() to synchronously
wait for the platform device to probe.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260327-gpio-kill-dev-sync-probe-v1-2-efac254f1a1d@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
This commit is contained in:
Bartosz Golaszewski 2026-03-27 11:31:12 +01:00
parent 7fb3287946
commit 3a27f40b45
2 changed files with 21 additions and 18 deletions
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1
drivers/gpio/Kconfig
View File

@ -2010,7 +2010,6 @@ menu "Virtual GPIO drivers"
config GPIO_AGGREGATOR
tristate "GPIO Aggregator"
select CONFIGFS_FS
select DEV_SYNC_PROBE
help
Say yes here to enable the GPIO Aggregator, which provides a way to
aggregate existing GPIO lines into a new virtual GPIO chip.

38
drivers/gpio/gpio-aggregator.c
View File

@ -32,8 +32,6 @@
#include <linux/gpio/forwarder.h>
#include <linux/gpio/machine.h>
#include "dev-sync-probe.h"
#define AGGREGATOR_MAX_GPIOS 512
#define AGGREGATOR_LEGACY_PREFIX "_sysfs"
@ -42,7 +40,7 @@
*/
struct gpio_aggregator {
struct dev_sync_probe_data probe_data;
struct platform_device *pdev;
struct config_group group;
struct gpiod_lookup_table *lookups;
struct mutex lock;
@ -135,7 +133,7 @@ static bool gpio_aggregator_is_active(struct gpio_aggregator *aggr)
{
lockdep_assert_held(&aggr->lock);
return aggr->probe_data.pdev && platform_get_drvdata(aggr->probe_data.pdev);
return aggr->pdev && platform_get_drvdata(aggr->pdev);
}
/* Only aggregators created via legacy sysfs can be "activating". */
@ -143,7 +141,7 @@ static bool gpio_aggregator_is_activating(struct gpio_aggregator *aggr)
{
lockdep_assert_held(&aggr->lock);
return aggr->probe_data.pdev && !platform_get_drvdata(aggr->probe_data.pdev);
return aggr->pdev && !platform_get_drvdata(aggr->pdev);
}
static size_t gpio_aggregator_count_lines(struct gpio_aggregator *aggr)
@ -909,6 +907,7 @@ static int gpio_aggregator_activate(struct gpio_aggregator *aggr)
{
struct platform_device_info pdevinfo;
struct gpio_aggregator_line *line;
struct platform_device *pdev;
struct fwnode_handle *swnode;
unsigned int n = 0;
int ret = 0;
@ -962,12 +961,23 @@ static int gpio_aggregator_activate(struct gpio_aggregator *aggr)
gpiod_add_lookup_table(aggr->lookups);
ret = dev_sync_probe_register(&aggr->probe_data, &pdevinfo);
if (ret)
pdev = platform_device_register_full(&pdevinfo);
if (IS_ERR(pdev)) {
ret = PTR_ERR(pdev);
goto err_remove_lookup_table;
}
wait_for_device_probe();
if (!device_is_bound(&pdev->dev)) {
ret = -ENXIO;
goto err_unregister_pdev;
}
aggr->pdev = pdev;
return 0;
err_unregister_pdev:
platform_device_unregister(pdev);
err_remove_lookup_table:
kfree(aggr->lookups->dev_id);
gpiod_remove_lookup_table(aggr->lookups);
@ -981,7 +991,8 @@ static int gpio_aggregator_activate(struct gpio_aggregator *aggr)
static void gpio_aggregator_deactivate(struct gpio_aggregator *aggr)
{
dev_sync_probe_unregister(&aggr->probe_data);
platform_device_unregister(aggr->pdev);
aggr->pdev = NULL;
gpiod_remove_lookup_table(aggr->lookups);
kfree(aggr->lookups->dev_id);
kfree(aggr->lookups);
@ -1145,7 +1156,7 @@ gpio_aggregator_device_dev_name_show(struct config_item *item, char *page)
guard(mutex)(&aggr->lock);
pdev = aggr->probe_data.pdev;
pdev = aggr->pdev;
if (pdev)
return sysfs_emit(page, "%s\n", dev_name(&pdev->dev));
@ -1322,7 +1333,6 @@ gpio_aggregator_make_group(struct config_group *group, const char *name)
return ERR_PTR(ret);
config_group_init_type_name(&aggr->group, name, &gpio_aggregator_device_type);
dev_sync_probe_init(&aggr->probe_data);
return &aggr->group;
}
@ -1471,12 +1481,6 @@ static ssize_t gpio_aggregator_new_device_store(struct device_driver *driver,
scnprintf(name, sizeof(name), "%s.%d", AGGREGATOR_LEGACY_PREFIX, aggr->id);
config_group_init_type_name(&aggr->group, name, &gpio_aggregator_device_type);
/*
* Since the device created by sysfs might be toggled via configfs
* 'live' attribute later, this initialization is needed.
*/
dev_sync_probe_init(&aggr->probe_data);
/* Expose to configfs */
res = configfs_register_group(&gpio_aggregator_subsys.su_group,
&aggr->group);
@ -1495,7 +1499,7 @@ static ssize_t gpio_aggregator_new_device_store(struct device_driver *driver,
goto remove_table;
}
aggr->probe_data.pdev = pdev;
aggr->pdev = pdev;
module_put(THIS_MODULE);
return count;