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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-03-04 13:51:13 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-04 18:38:33 +0100 |
| commit | 1c21f14ec48a2256fb03682b24dddd23eacdc96f (patch) | |
| tree | 03b6ecf8d87074d1f154ff8ac794e9084e00d7cd /kernel/lockdep.c | |
| parent | 6700ec65c207068a81a535e9dca616fefac21671 (diff) | |
| download | linux-1c21f14ec48a2256fb03682b24dddd23eacdc96f.tar.gz linux-1c21f14ec48a2256fb03682b24dddd23eacdc96f.tar.bz2 linux-1c21f14ec48a2256fb03682b24dddd23eacdc96f.zip | |
lockdep: fix incorrect state name
In the recent mark_lock_irq() rework a bug snuck in that would report the
state of write locks causing irq inversion under a read lock as a read
lock.
Fix this by masking the read bit of the state when validating write
dependencies.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1236172646.5330.7450.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/lockdep.c')
| -rw-r--r-- | kernel/lockdep.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 022d2ed7fd8b..ef6584fd9fe5 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -2015,7 +2015,8 @@ typedef int (*check_usage_f)(struct task_struct *, struct held_lock *, enum lock_usage_bit bit, const char *name); static int -mark_lock_irq(struct task_struct *curr, struct held_lock *this, int new_bit) +mark_lock_irq(struct task_struct *curr, struct held_lock *this, + enum lock_usage_bit new_bit) { int excl_bit = exclusive_bit(new_bit); int read = new_bit & 1; @@ -2043,7 +2044,7 @@ mark_lock_irq(struct task_struct *curr, struct held_lock *this, int new_bit) * states. */ if ((!read || !dir || STRICT_READ_CHECKS) && - !usage(curr, this, excl_bit, state_name(new_bit))) + !usage(curr, this, excl_bit, state_name(new_bit & ~1))) return 0; /* |