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authorColin Cross <ccross@android.com>2013-05-06 23:50:06 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-05-12 14:16:21 +0200
commit416ad3c9c0066405b83ec875b75496523549be09 (patch)
tree393d8c261cf9b79c18197d3173e0b8aa8874ca35 /include/linux/freezer.h
parentf722406faae2d073cc1d01063d1123c35425939e (diff)
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freezer: add unsafe versions of freezable helpers for NFS
NFS calls the freezable helpers with locks held, which is unsafe and will cause lockdep warnings when 6aa9707 "lockdep: check that no locks held at freeze time" is reapplied (it was reverted in dbf520a). NFS shouldn't be doing this, but it has long-running syscalls that must hold a lock but also shouldn't block suspend. Until NFS freeze handling is rewritten to use a signal to exit out of the critical section, add new *_unsafe versions of the helpers that will not run the lockdep test when 6aa9707 is reapplied, and call them from NFS. In practice the likley result of holding the lock while freezing is that a second task blocked on the lock will never freeze, aborting suspend, but it is possible to manufacture a case using the cgroup freezer, the lock, and the suspend freezer to create a deadlock. Silencing the lockdep warning here will allow problems to be found in other drivers that may have a more serious deadlock risk, and prevent new problems from being added. Signed-off-by: Colin Cross <ccross@android.com> Acked-by: Pavel Machek <pavel@ucw.cz> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/freezer.h')
-rw-r--r--include/linux/freezer.h42
1 files changed, 41 insertions, 1 deletions
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index e70df40d84f6..5b31e21c485f 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -46,7 +46,11 @@ extern int freeze_kernel_threads(void);
extern void thaw_processes(void);
extern void thaw_kernel_threads(void);
-static inline bool try_to_freeze(void)
+/*
+ * DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION
+ * If try_to_freeze causes a lockdep warning it means the caller may deadlock
+ */
+static inline bool try_to_freeze_unsafe(void)
{
might_sleep();
if (likely(!freezing(current)))
@@ -54,6 +58,11 @@ static inline bool try_to_freeze(void)
return __refrigerator(false);
}
+static inline bool try_to_freeze(void)
+{
+ return try_to_freeze_unsafe();
+}
+
extern bool freeze_task(struct task_struct *p);
extern bool set_freezable(void);
@@ -115,6 +124,14 @@ static inline void freezer_count(void)
try_to_freeze();
}
+/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */
+static inline void freezer_count_unsafe(void)
+{
+ current->flags &= ~PF_FREEZER_SKIP;
+ smp_mb();
+ try_to_freeze_unsafe();
+}
+
/**
* freezer_should_skip - whether to skip a task when determining frozen
* state is reached
@@ -152,6 +169,14 @@ static inline bool freezer_should_skip(struct task_struct *p)
freezer_count(); \
})
+/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */
+#define freezable_schedule_unsafe() \
+({ \
+ freezer_do_not_count(); \
+ schedule(); \
+ freezer_count_unsafe(); \
+})
+
/* Like schedule_timeout_killable(), but should not block the freezer. */
#define freezable_schedule_timeout_killable(timeout) \
({ \
@@ -162,6 +187,16 @@ static inline bool freezer_should_skip(struct task_struct *p)
__retval; \
})
+/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */
+#define freezable_schedule_timeout_killable_unsafe(timeout) \
+({ \
+ long __retval; \
+ freezer_do_not_count(); \
+ __retval = schedule_timeout_killable(timeout); \
+ freezer_count_unsafe(); \
+ __retval; \
+})
+
/*
* Freezer-friendly wrappers around wait_event_interruptible(),
* wait_event_killable() and wait_event_interruptible_timeout(), originally
@@ -225,9 +260,14 @@ static inline void set_freezable(void) {}
#define freezable_schedule() schedule()
+#define freezable_schedule_unsafe() schedule()
+
#define freezable_schedule_timeout_killable(timeout) \
schedule_timeout_killable(timeout)
+#define freezable_schedule_timeout_killable_unsafe(timeout) \
+ schedule_timeout_killable(timeout)
+
#define wait_event_freezable(wq, condition) \
wait_event_interruptible(wq, condition)