__check_region
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## Name

__check_region — check if a resource region is busy or free

## Synopsis

`int __check_region (` | struct resource * parent,
| resource_size_t start,
| resource_size_t n`)`;

## Arguments

`parent`

  parent resource descriptor

`start`

  resource start address

`n`

  resource region size

## Description

Returns 0 if the region is free at the moment it is checked, returns `-EBUSY` if the region is busy.

## NOTE

This function is deprecated because its use is racy. Even if it returns 0, a subsequent call to `request_region` may fail because another driver etc. just allocated the region. Do NOT use it. It will be removed from the kernel.

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