1__CHECK_REGION(9)             Hardware Interfaces            __CHECK_REGION(9)
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NAME

6       __check_region - check if a resource region is busy or free
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SYNOPSIS

9       int __check_region(struct resource * parent, resource_size_t start,
10                          resource_size_t n);
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ARGUMENTS

13       parent
14           parent resource descriptor
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16       start
17           resource start address
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19       n
20           resource region size
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DESCRIPTION

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

27       This function is deprecated because its use is racy. Even if it returns
28       0, a subsequent call to request_region may fail because another driver
29       etc. just allocated the region. Do NOT use it. It will be removed from
30       the kernel.
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33Kernel Hackers Manual 2.6.         June 2019                 __CHECK_REGION(9)
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