diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/Kconfig | 6 | ||||
| -rw-r--r-- | kernel/power/wakelock.c | 31 |
2 files changed, 32 insertions, 5 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 1d534076d33a..08783eda9ce4 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -119,6 +119,12 @@ config PM_WAKELOCKS Allow user space to create, activate and deactivate wakeup source objects with the help of a sysfs-based interface. +config PM_WAKELOCKS_LIMIT + int "Maximum number of user space wakeup sources (0 = no limit)" + range 0 100000 + default 100 + depends on PM_WAKELOCKS + config PM_RUNTIME bool "Run-time PM core functionality" depends on !IA64_HP_SIM diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c index 579700665e8c..dc34b9d3b7d8 100644 --- a/kernel/power/wakelock.c +++ b/kernel/power/wakelock.c @@ -17,7 +17,6 @@ #include <linux/rbtree.h> #include <linux/slab.h> -#define WL_NUMBER_LIMIT 100 #define WL_GC_COUNT_MAX 100 #define WL_GC_TIME_SEC 300 @@ -32,7 +31,6 @@ struct wakelock { static struct rb_root wakelocks_tree = RB_ROOT; static LIST_HEAD(wakelocks_lru_list); -static unsigned int number_of_wakelocks; static unsigned int wakelocks_gc_count; ssize_t pm_show_wakelocks(char *buf, bool show_active) @@ -58,6 +56,29 @@ ssize_t pm_show_wakelocks(char *buf, bool show_active) return (str - buf); } +#if CONFIG_PM_WAKELOCKS_LIMIT > 0 +static unsigned int number_of_wakelocks; + +static inline bool wakelocks_limit_exceeded(void) +{ + return number_of_wakelocks > CONFIG_PM_WAKELOCKS_LIMIT; +} + +static inline void increment_wakelocks_number(void) +{ + number_of_wakelocks++; +} + +static inline void decrement_wakelocks_number(void) +{ + number_of_wakelocks--; +} +#else /* CONFIG_PM_WAKELOCKS_LIMIT = 0 */ +static inline bool wakelocks_limit_exceeded(void) { return false; } +static inline void increment_wakelocks_number(void) {} +static inline void decrement_wakelocks_number(void) {} +#endif /* CONFIG_PM_WAKELOCKS_LIMIT */ + static struct wakelock *wakelock_lookup_add(const char *name, size_t len, bool add_if_not_found) { @@ -85,7 +106,7 @@ static struct wakelock *wakelock_lookup_add(const char *name, size_t len, if (!add_if_not_found) return ERR_PTR(-EINVAL); - if (number_of_wakelocks > WL_NUMBER_LIMIT) + if (wakelocks_limit_exceeded()) return ERR_PTR(-ENOSPC); /* Not found, we have to add a new one. */ @@ -103,7 +124,7 @@ static struct wakelock *wakelock_lookup_add(const char *name, size_t len, rb_link_node(&wl->node, parent, node); rb_insert_color(&wl->node, &wakelocks_tree); list_add(&wl->lru, &wakelocks_lru_list); - number_of_wakelocks++; + increment_wakelocks_number(); return wl; } @@ -175,7 +196,7 @@ static void wakelocks_gc(void) list_del(&wl->lru); kfree(wl->name); kfree(wl); - number_of_wakelocks--; + decrement_wakelocks_number(); } } wakelocks_gc_count = 0; |