__unregister_chrdev_region

Name:__unregister_chrdev_region

Proto:static struct char_device_struct *__unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct)

Type:struct char_device_struct

Parameter:

Type	Parameter	Name
unsigned	major
unsigned	baseminor
int	minorct

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cd = NULL

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i = dex in the above

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mutex_lock( & chrdevs_lock)

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When cp cycle If major == major && baseminor == baseminor && minorct == minorct Then

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Break

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If cp Then

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cd = cp

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cp = next

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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.

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Return cd

**Caller**
Name	Describe
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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