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8021q: fix a potential memory leak
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1 /*
2 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #ifndef __LINUX_CPUFEATURE_H
10 #define __LINUX_CPUFEATURE_H
11
12 #ifdef CONFIG_GENERIC_CPU_AUTOPROBE
13
14 #include <linux/mod_devicetable.h>
15 #include <asm/cpufeature.h>
16
17 /*
18 * Macros imported from <asm/cpufeature.h>:
19 * - cpu_feature(x) ordinal value of feature called 'x'
20 * - cpu_have_feature(u32 n) whether feature #n is available
21 * - MAX_CPU_FEATURES upper bound for feature ordinal values
22 * Optional:
23 * - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type
24 * - CPU_FEATURE_TYPEVAL set of values matching the format string above
25 */
26
27 #ifndef CPU_FEATURE_TYPEFMT
28 #define CPU_FEATURE_TYPEFMT "%s"
29 #endif
30
31 #ifndef CPU_FEATURE_TYPEVAL
32 #define CPU_FEATURE_TYPEVAL ELF_PLATFORM
33 #endif
34
35 /*
36 * Use module_cpu_feature_match(feature, module_init_function) to
37 * declare that
38 * a) the module shall be probed upon discovery of CPU feature 'feature'
39 * (typically at boot time using udev)
40 * b) the module must not be loaded if CPU feature 'feature' is not present
41 * (not even by manual insmod).
42 *
43 * For a list of legal values for 'feature', please consult the file
44 * 'asm/cpufeature.h' of your favorite architecture.
45 */
46 #define module_cpu_feature_match(x, __init) \
47 static struct cpu_feature const cpu_feature_match_ ## x[] = \
48 { { .feature = cpu_feature(x) }, { } }; \
49 MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \
50 \
51 static int cpu_feature_match_ ## x ## _init(void) \
52 { \
53 if (!cpu_have_feature(cpu_feature(x))) \
54 return -ENODEV; \
55 return __init(); \
56 } \
57 module_init(cpu_feature_match_ ## x ## _init)
58
59 #endif
60 #endif