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watchdog: Add a device managed API for watchdog_register_device()

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This helps in reducing code in .remove callbacks and sometimes
dropping .remove callbacks entirely.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Neil Armstrong 2016-05-27 17:33:54 +02:00 committed by Wim Van Sebroeck
parent 47ef4ad268
commit 83fbae5a14
3 changed files with 43 additions and 0 deletions
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3
Documentation/driver-model/devres.txt
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@ -357,3 +357,6 @@ SLAVE DMA ENGINE
SPI
devm_spi_register_master()
WATCHDOG
devm_watchdog_register_device()

37
drivers/watchdog/watchdog_core.c
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@ -329,6 +329,43 @@ void watchdog_unregister_device(struct watchdog_device *wdd)
EXPORT_SYMBOL_GPL(watchdog_unregister_device);
static void devm_watchdog_unregister_device(struct device *dev, void *res)
{
watchdog_unregister_device(*(struct watchdog_device **)res);
}
/**
* devm_watchdog_register_device() - resource managed watchdog_register_device()
* @dev: device that is registering this watchdog device
* @wdd: watchdog device
*
* Managed watchdog_register_device(). For watchdog device registered by this
* function, watchdog_unregister_device() is automatically called on driver
* detach. See watchdog_register_device() for more information.
*/
int devm_watchdog_register_device(struct device *dev,
struct watchdog_device *wdd)
{
struct watchdog_device **rcwdd;
int ret;
rcwdd = devres_alloc(devm_watchdog_unregister_device, sizeof(*wdd),
GFP_KERNEL);
if (!rcwdd)
return -ENOMEM;
ret = watchdog_register_device(wdd);
if (!ret) {
*rcwdd = wdd;
devres_add(dev, rcwdd);
} else {
devres_free(rcwdd);
}
return ret;
}
EXPORT_SYMBOL_GPL(devm_watchdog_register_device);
static int __init watchdog_deferred_registration(void)
{
mutex_lock(&wtd_deferred_reg_mutex);

3
include/linux/watchdog.h
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@ -180,4 +180,7 @@ extern int watchdog_init_timeout(struct watchdog_device *wdd,
extern int watchdog_register_device(struct watchdog_device *);
extern void watchdog_unregister_device(struct watchdog_device *);
/* devres register variant */
int devm_watchdog_register_device(struct device *dev, struct watchdog_device *);
#endif /* ifndef _LINUX_WATCHDOG_H */