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watchdog: Create watchdog device in watchdog_dev.c

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The watchdog character device is currently created in watchdog_dev.c,
and the watchdog device in watchdog_core.c. This results in
cross-dependencies, since device creation needs to know the watchdog
character device number as well as the watchdog class, both of which
reside in watchdog_dev.c.

Create the watchdog device in watchdog_dev.c to simplify the code.

Inspired by earlier patch set from Damien Riegel.

Cc: Damien Riegel <damien.riegel@savoirfairelinux.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck 2015-12-25 16:01:40 -08:00 committed by Wim Van Sebroeck
parent 0933b453f1
commit 32ecc63926
3 changed files with 69 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/watchdog/watchdog_core.c
View File

@ -42,7 +42,6 @@
#include "watchdog_core.h" /* For watchdog_dev_register/... */
static DEFINE_IDA(watchdog_ida);
static struct class *watchdog_class;
/*
* Deferred Registration infrastructure.
@ -194,7 +193,7 @@ EXPORT_SYMBOL_GPL(watchdog_set_restart_priority);
static int __watchdog_register_device(struct watchdog_device *wdd)
{
int ret, id = -1, devno;
int ret, id = -1;
if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
return -EINVAL;
@ -247,16 +246,6 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
}
}
devno = wdd->cdev.dev;
wdd->dev = device_create(watchdog_class, wdd->parent, devno,
wdd, "watchdog%d", wdd->id);
if (IS_ERR(wdd->dev)) {
watchdog_dev_unregister(wdd);
ida_simple_remove(&watchdog_ida, id);
ret = PTR_ERR(wdd->dev);
return ret;
}
if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
@ -265,9 +254,7 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
dev_err(wdd->dev, "Cannot register reboot notifier (%d)\n",
ret);
watchdog_dev_unregister(wdd);
device_destroy(watchdog_class, devno);
ida_simple_remove(&watchdog_ida, wdd->id);
wdd->dev = NULL;
return ret;
}
}
@ -311,9 +298,6 @@ EXPORT_SYMBOL_GPL(watchdog_register_device);
static void __watchdog_unregister_device(struct watchdog_device *wdd)
{
int ret;
int devno;
if (wdd == NULL)
return;
@ -323,13 +307,8 @@ static void __watchdog_unregister_device(struct watchdog_device *wdd)
if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status))
unregister_reboot_notifier(&wdd->reboot_nb);
devno = wdd->cdev.dev;
ret = watchdog_dev_unregister(wdd);
if (ret)
pr_err("error unregistering /dev/watchdog (err=%d)\n", ret);
device_destroy(watchdog_class, devno);
watchdog_dev_unregister(wdd);
ida_simple_remove(&watchdog_ida, wdd->id);
wdd->dev = NULL;
}
/**
@ -370,9 +349,11 @@ static int __init watchdog_deferred_registration(void)
static int __init watchdog_init(void)
{
watchdog_class = watchdog_dev_init();
if (IS_ERR(watchdog_class))
return PTR_ERR(watchdog_class);
int err;
err = watchdog_dev_init();
if (err < 0)
return err;
watchdog_deferred_registration();
return 0;

4
drivers/watchdog/watchdog_core.h
View File

@ -32,6 +32,6 @@
* Functions/procedures to be called by the core
*/
extern int watchdog_dev_register(struct watchdog_device *);
extern int watchdog_dev_unregister(struct watchdog_device *);
extern struct class * __init watchdog_dev_init(void);
extern void watchdog_dev_unregister(struct watchdog_device *);
extern int __init watchdog_dev_init(void);
extern void __exit watchdog_dev_exit(void);

73
drivers/watchdog/watchdog_dev.c
View File

@ -628,17 +628,18 @@ static struct miscdevice watchdog_miscdev = {
};
/*
* watchdog_dev_register: register a watchdog device
* watchdog_cdev_register: register watchdog character device
* @wdd: watchdog device
* @devno: character device number
*
* Register a watchdog device including handling the legacy
* Register a watchdog character device including handling the legacy
* /dev/watchdog node. /dev/watchdog is actually a miscdevice and
* thus we set it up like that.
*/
int watchdog_dev_register(struct watchdog_device *wdd)
static int watchdog_cdev_register(struct watchdog_device *wdd, dev_t devno)
{
int err, devno;
int err;
if (wdd->id == 0) {
old_wdd = wdd;
@ -656,7 +657,6 @@ int watchdog_dev_register(struct watchdog_device *wdd)
}
/* Fill in the data structures */
devno = MKDEV(MAJOR(watchdog_devt), wdd->id);
cdev_init(&wdd->cdev, &watchdog_fops);
wdd->cdev.owner = wdd->ops->owner;
@ -674,13 +674,14 @@ int watchdog_dev_register(struct watchdog_device *wdd)
}
/*
* watchdog_dev_unregister: unregister a watchdog device
* watchdog_cdev_unregister: unregister watchdog character device
* @watchdog: watchdog device
*
* Unregister the watchdog and if needed the legacy /dev/watchdog device.
* Unregister watchdog character device and if needed the legacy
* /dev/watchdog device.
*/
int watchdog_dev_unregister(struct watchdog_device *wdd)
static void watchdog_cdev_unregister(struct watchdog_device *wdd)
{
mutex_lock(&wdd->lock);
set_bit(WDOG_UNREGISTERED, &wdd->status);
@ -691,7 +692,6 @@ int watchdog_dev_unregister(struct watchdog_device *wdd)
misc_deregister(&watchdog_miscdev);
old_wdd = NULL;
}
return 0;
}
static struct class watchdog_class = {
@ -700,30 +700,77 @@ static struct class watchdog_class = {
.dev_groups = wdt_groups,
};
/*
* watchdog_dev_register: register a watchdog device
* @wdd: watchdog device
*
* Register a watchdog device including handling the legacy
* /dev/watchdog node. /dev/watchdog is actually a miscdevice and
* thus we set it up like that.
*/
int watchdog_dev_register(struct watchdog_device *wdd)
{
struct device *dev;
dev_t devno;
int ret;
devno = MKDEV(MAJOR(watchdog_devt), wdd->id);
ret = watchdog_cdev_register(wdd, devno);
if (ret)
return ret;
dev = device_create(&watchdog_class, wdd->parent, devno, wdd,
"watchdog%d", wdd->id);
if (IS_ERR(dev)) {
watchdog_cdev_unregister(wdd);
return PTR_ERR(dev);
}
wdd->dev = dev;
return ret;
}
/*
* watchdog_dev_unregister: unregister a watchdog device
* @watchdog: watchdog device
*
* Unregister watchdog device and if needed the legacy
* /dev/watchdog device.
*/
void watchdog_dev_unregister(struct watchdog_device *wdd)
{
watchdog_cdev_unregister(wdd);
device_destroy(&watchdog_class, wdd->dev->devt);
wdd->dev = NULL;
}
/*
* watchdog_dev_init: init dev part of watchdog core
*
* Allocate a range of chardev nodes to use for watchdog devices
*/
struct class * __init watchdog_dev_init(void)
int __init watchdog_dev_init(void)
{
int err;
err = class_register(&watchdog_class);
if (err < 0) {
pr_err("couldn't register class\n");
return ERR_PTR(err);
return err;
}
err = alloc_chrdev_region(&watchdog_devt, 0, MAX_DOGS, "watchdog");
if (err < 0) {
pr_err("watchdog: unable to allocate char dev region\n");
class_unregister(&watchdog_class);
return ERR_PTR(err);
return err;
}
return &watchdog_class;
return 0;
}
/*