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| author | Ingo Molnar <mingo@elte.hu> | 2006-07-03 00:24:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-03 15:27:04 -0700 |
| commit | 6c9076ec9cd448f43bbda871352a7067f456ee26 (patch) | |
| tree | 8691366aa511f20146eb9cfe942e0d94c4136e1a /kernel | |
| parent | fbb9ce9530fd9b66096d5187fa6a115d16d9746c (diff) | |
| download | talos-obmc-linux-6c9076ec9cd448f43bbda871352a7067f456ee26.tar.gz talos-obmc-linux-6c9076ec9cd448f43bbda871352a7067f456ee26.zip | |
[PATCH] lockdep: allow read_lock() recursion of same class
From: Ingo Molnar <mingo@elte.hu>
lockdep so far only allowed read-recursion for the same lock instance.
This is enough in the overwhelming majority of cases, but a hostap case
triggered and reported by Miles Lane relies on same-class
different-instance recursion. So we relax the restriction on read-lock
recursion.
(This change does not allow rwsem read-recursion, which is still
forbidden.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/lockdep.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index dd0580910a97..f32ca78c198d 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -843,10 +843,9 @@ check_deadlock(struct task_struct *curr, struct held_lock *next, continue; /* * Allow read-after-read recursion of the same - * lock instance (i.e. read_lock(lock)+read_lock(lock)): + * lock class (i.e. read_lock(lock)+read_lock(lock)): */ - if ((read == 2) && prev->read && - (prev->instance == next_instance)) + if ((read == 2) && prev->read) return 2; return print_deadlock_bug(curr, prev, next); } |
