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gpio: sim: stop using dev-sync-probe

Browse Source 
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-v1-1-efac254f1a1d@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
This commit is contained in:
Bartosz Golaszewski
2026-03-27 11:31:11 +01:00
parent 15cbd66b69
commit 7fb3287946
2 changed files with 29 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpio/Kconfig
View File

@@ -2062,7 +2062,6 @@ config GPIO_SIM
tristate "GPIO Simulator Module"
select IRQ_SIM
select CONFIGFS_FS
select DEV_SYNC_PROBE
help
This enables the GPIO simulator - a configfs-based GPIO testing
driver.

49
drivers/gpio/gpio-sim.c
View File

@@ -36,8 +36,6 @@
#include <linux/sysfs.h>
#include <linux/types.h>
#include "dev-sync-probe.h"
#define GPIO_SIM_NGPIO_MAX 1024
#define GPIO_SIM_PROP_MAX 5 /* Max 4 properties + sentinel. */
#define GPIO_SIM_HOG_PROP_MAX 5
@@ -546,7 +544,7 @@ static struct platform_driver gpio_sim_driver = {
};
struct gpio_sim_device {
struct dev_sync_probe_data probe_data;
struct platform_device *pdev;
struct config_group group;
int id;
@@ -673,7 +671,7 @@ static bool gpio_sim_device_is_live(struct gpio_sim_device *dev)
{
lockdep_assert_held(&dev->lock);
return !!dev->probe_data.pdev;
return !!dev->pdev;
}
static char *gpio_sim_strdup_trimmed(const char *str, size_t count)
@@ -695,7 +693,7 @@ static ssize_t gpio_sim_device_config_dev_name_show(struct config_item *item,
guard(mutex)(&dev->lock);
pdev = dev->probe_data.pdev;
pdev = dev->pdev;
if (pdev)
return sprintf(page, "%s\n", dev_name(&pdev->dev));
@@ -900,6 +898,7 @@ static bool gpio_sim_bank_labels_non_unique(struct gpio_sim_device *dev)
static int gpio_sim_device_activate(struct gpio_sim_device *dev)
{
struct platform_device_info pdevinfo;
struct platform_device *pdev;
struct fwnode_handle *swnode;
struct gpio_sim_bank *bank;
int ret;
@@ -927,28 +926,39 @@ static int gpio_sim_device_activate(struct gpio_sim_device *dev)
bank->swnode = gpio_sim_make_bank_swnode(bank, swnode);
if (IS_ERR(bank->swnode)) {
ret = PTR_ERR(bank->swnode);
gpio_sim_remove_swnode_recursive(swnode);
return ret;
goto err_remove_swnode;
}
ret = gpio_sim_bank_add_hogs(bank);
if (ret) {
gpio_sim_remove_swnode_recursive(swnode);
return ret;
}
if (ret)
goto err_remove_swnode;
}
pdevinfo.name = "gpio-sim";
pdevinfo.fwnode = swnode;
pdevinfo.id = dev->id;
ret = dev_sync_probe_register(&dev->probe_data, &pdevinfo);
if (ret) {
gpio_sim_remove_swnode_recursive(swnode);
return ret;
pdev = platform_device_register_full(&pdevinfo);
if (IS_ERR(pdev)) {
ret = PTR_ERR(pdev);
goto err_remove_swnode;
}
wait_for_device_probe();
if (!device_is_bound(&pdev->dev)) {
ret = -ENXIO;
goto err_unregister_pdev;
}
dev->pdev = pdev;
return 0;
err_unregister_pdev:
platform_device_unregister(pdev);
err_remove_swnode:
gpio_sim_remove_swnode_recursive(swnode);
return ret;
}
static void gpio_sim_device_deactivate(struct gpio_sim_device *dev)
@@ -957,8 +967,9 @@ static void gpio_sim_device_deactivate(struct gpio_sim_device *dev)
lockdep_assert_held(&dev->lock);
swnode = dev_fwnode(&dev->probe_data.pdev->dev);
dev_sync_probe_unregister(&dev->probe_data);
swnode = dev_fwnode(&dev->pdev->dev);
platform_device_unregister(dev->pdev);
dev->pdev = NULL;
gpio_sim_remove_swnode_recursive(swnode);
}
@@ -1060,7 +1071,7 @@ static ssize_t gpio_sim_bank_config_chip_name_show(struct config_item *item,
guard(mutex)(&dev->lock);
if (gpio_sim_device_is_live(dev))
return device_for_each_child(&dev->probe_data.pdev->dev, &ctx,
return device_for_each_child(&dev->pdev->dev, &ctx,
gpio_sim_emit_chip_name);
return sprintf(page, "none\n");
@@ -1571,8 +1582,6 @@ gpio_sim_config_make_device_group(struct config_group *group, const char *name)
mutex_init(&dev->lock);
INIT_LIST_HEAD(&dev->bank_list);
dev_sync_probe_init(&dev->probe_data);
return &no_free_ptr(dev)->group;
}