__unregister_chrdev_region

函数名称：__unregister_chrdev_region

函数原型：static struct char_device_struct *__unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct)

返回类型：struct char_device_struct

参数：

类型	参数	名称
unsigned	major
unsigned	baseminor
int	minorct

174

cd等于NULL

175

i等于dex in the above

177

mutex_lock( & chrdevs_lock)

178

以cp 循环如果major恒等于major且baseminor恒等于baseminor且minorct恒等于minorct则

182

183

如果cp则

184

cd等于cp

185

cp等于next

187

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

188

返回:cd

**调用者**
名称	描述
register_chrdev_region	gister_chrdev_region() - register a range of device numbers@from: the first in the desired range of device numbers; must include the major number.@count: the number of consecutive device numbers required@name: the name of the device or driver.
__register_chrdev	__register_chrdev() - create and register a cdev occupying a range of minors@major: major device number or 0 for dynamic allocation@baseminor: first of the requested range of minor numbers@count: the number of minor numbers required@name: name of this
unregister_chrdev_region	register_chrdev_region() - unregister a range of device numbers@from: the first in the range of numbers to unregister@count: the number of device numbers to unregister* This function will unregister a range of @count device numbers,* starting with @from
__unregister_chrdev	__unregister_chrdev - unregister and destroy a cdev@major: major device number@baseminor: first of the range of minor numbers@count: the number of minor numbers this cdev is occupying@name: name of this range of devices* Unregister and destroy the

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