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| author | Christine Chan <cschan@codeaurora.org> | 2011-11-07 19:48:27 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-11-23 18:49:22 +0100 |
| commit | b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 (patch) | |
| tree | 4a43e7224c49f1ef9b3f25d38a80c29c2692b8dc /lib | |
| parent | feac18dda25134005909e7770c77464e65608bd8 (diff) | |
| download | linux-3.10-b84d435cc228e87951f3bbabf6cc4a5f25d5fb16.tar.gz linux-3.10-b84d435cc228e87951f3bbabf6cc4a5f25d5fb16.tar.bz2 linux-3.10-b84d435cc228e87951f3bbabf6cc4a5f25d5fb16.zip | |
debugobjects: Extend to assert that an object is initialized
Calling del_timer_sync() on an uninitialized timer leads to a
never ending loop in lock_timer_base() that spins checking for a
non-NULL timer base. Add an assertion to debugobjects to catch
usage of uninitialized objects so that we can initialize timers
in the del_timer_sync() path before it calls lock_timer_base().
[ sboyd@codeaurora.org: Clarify commit message ]
Signed-off-by: Christine Chan <cschan@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/1320724108-20788-3-git-send-email-sboyd@codeaurora.org
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/debugobjects.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/debugobjects.c b/lib/debugobjects.c index b7a530504b3..77cb245f8e7 100644 --- a/lib/debugobjects.c +++ b/lib/debugobjects.c @@ -571,6 +571,44 @@ out_unlock: } /** + * debug_object_assert_init - debug checks when object should be init-ed + * @addr: address of the object + * @descr: pointer to an object specific debug description structure + */ +void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) +{ + struct debug_bucket *db; + struct debug_obj *obj; + unsigned long flags; + + if (!debug_objects_enabled) + return; + + db = get_bucket((unsigned long) addr); + + raw_spin_lock_irqsave(&db->lock, flags); + + obj = lookup_object(addr, db); + if (!obj) { + struct debug_obj o = { .object = addr, + .state = ODEBUG_STATE_NOTAVAILABLE, + .descr = descr }; + + raw_spin_unlock_irqrestore(&db->lock, flags); + /* + * Maybe the object is static. Let the type specific + * code decide what to do. + */ + if (debug_object_fixup(descr->fixup_assert_init, addr, + ODEBUG_STATE_NOTAVAILABLE)) + debug_print_object(&o, "assert_init"); + return; + } + + raw_spin_unlock_irqrestore(&db->lock, flags); +} + +/** * debug_object_active_state - debug checks object usage state machine * @addr: address of the object * @descr: pointer to an object specific debug description structure |