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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-04 14:26:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-04 14:26:40 -0700
commit64ebe987311853ea857a244439de5b947a4b1b07 (patch)
treeb33ab6efd7f118e0f6ab5a6bcbd59ba31a313da5 /include
parenta5149bf3fed59b94207809704b5d06fec337a771 (diff)
parentc4772d192c70b61d52262b0db76f7abd8aeb51c6 (diff)
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Merge tag 'pm-for-3.4-part-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more power management updates from Rafael Wysocki: - Patch series that hopefully fixes races between the freezer and request_firmware() and request_firmware_nowait() for good, with two cleanups from Stephen Boyd on top. - Runtime PM fix from Alan Stern preventing tasks from getting stuck indefinitely in the runtime PM wait queue. - Device PM QoS update from MyungJoo Ham introducing a new variant of pm_qos_update_request() allowing the callers to specify a timeout. * tag 'pm-for-3.4-part-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: PM / QoS: add pm_qos_update_request_timeout() API firmware_class: Move request_firmware_nowait() to workqueues firmware_class: Reorganize fw_create_instance() PM / Sleep: Mitigate race between the freezer and request_firmware() PM / Sleep: Move disabling of usermode helpers to the freezer PM / Hibernate: Disable usermode helpers right before freezing tasks firmware_class: Do not warn that system is not ready from async loads firmware_class: Split _request_firmware() into three functions, v2 firmware_class: Rework usermodehelper check PM / Runtime: don't forget to wake up waitqueue on failure
Diffstat (limited to 'include')
-rw-r--r--include/linux/kmod.h27
-rw-r--r--include/linux/pm_qos.h4
2 files changed, 26 insertions, 5 deletions
diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index 9efeae679106..dd99c329e161 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -110,12 +110,29 @@ call_usermodehelper(char *path, char **argv, char **envp, int wait)
extern struct ctl_table usermodehelper_table[];
+enum umh_disable_depth {
+ UMH_ENABLED = 0,
+ UMH_FREEZING,
+ UMH_DISABLED,
+};
+
extern void usermodehelper_init(void);
-extern int usermodehelper_disable(void);
-extern void usermodehelper_enable(void);
-extern bool usermodehelper_is_disabled(void);
-extern void read_lock_usermodehelper(void);
-extern void read_unlock_usermodehelper(void);
+extern int __usermodehelper_disable(enum umh_disable_depth depth);
+extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
+
+static inline int usermodehelper_disable(void)
+{
+ return __usermodehelper_disable(UMH_DISABLED);
+}
+
+static inline void usermodehelper_enable(void)
+{
+ __usermodehelper_set_disable_depth(UMH_ENABLED);
+}
+
+extern int usermodehelper_read_trylock(void);
+extern long usermodehelper_read_lock_wait(long timeout);
+extern void usermodehelper_read_unlock(void);
#endif /* __LINUX_KMOD_H__ */
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 2e9191a712f3..233149cb19f4 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -8,6 +8,7 @@
#include <linux/notifier.h>
#include <linux/miscdevice.h>
#include <linux/device.h>
+#include <linux/workqueue.h>
enum {
PM_QOS_RESERVED = 0,
@@ -29,6 +30,7 @@ enum {
struct pm_qos_request {
struct plist_node node;
int pm_qos_class;
+ struct delayed_work work; /* for pm_qos_update_request_timeout */
};
struct dev_pm_qos_request {
@@ -73,6 +75,8 @@ void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
s32 value);
void pm_qos_update_request(struct pm_qos_request *req,
s32 new_value);
+void pm_qos_update_request_timeout(struct pm_qos_request *req,
+ s32 new_value, unsigned long timeout_us);
void pm_qos_remove_request(struct pm_qos_request *req);
int pm_qos_request(int pm_qos_class);