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8021q: fix a potential memory leak
[mirror_ubuntu-bionic-kernel.git] / include / linux / err.h
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1#ifndef _LINUX_ERR_H
2#define _LINUX_ERR_H
3
4#include <linux/compiler.h>
a5ed3cee 5#include <linux/types.h>
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6
7#include <asm/errno.h>
8
9/*
10 * Kernel pointers have redundant information, so we can use a
a5ed3cee 11 * scheme where we can return either an error code or a normal
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12 * pointer with the same return value.
13 *
14 * This should be a per-architecture thing, to allow different
15 * error and pointer decisions.
16 */
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17#define MAX_ERRNO 4095
18
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19#ifndef __ASSEMBLY__
20
fa79837d 21#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
07ab67c8 22
e47103b1 23static inline void * __must_check ERR_PTR(long error)
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24{
25 return (void *) error;
26}
27
e7152b97 28static inline long __must_check PTR_ERR(__force const void *ptr)
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29{
30 return (long) ptr;
31}
32
a5ed3cee 33static inline bool __must_check IS_ERR(__force const void *ptr)
1da177e4 34{
07ab67c8 35 return IS_ERR_VALUE((unsigned long)ptr);
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36}
37
a5ed3cee 38static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
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39{
40 return !ptr || IS_ERR_VALUE((unsigned long)ptr);
41}
42
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43/**
44 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
45 * @ptr: The pointer to cast.
46 *
47 * Explicitly cast an error-valued pointer to another pointer type in such a
48 * way as to make it clear that's what's going on.
49 */
e7152b97 50static inline void * __must_check ERR_CAST(__force const void *ptr)
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51{
52 /* cast away the const */
53 return (void *) ptr;
54}
55
6e8b8726 56static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
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57{
58 if (IS_ERR(ptr))
59 return PTR_ERR(ptr);
60 else
61 return 0;
62}
63
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64/* Deprecated */
65#define PTR_RET(p) PTR_ERR_OR_ZERO(p)
66
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67#endif
68
1da177e4 69#endif /* _LINUX_ERR_H */