Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=21778867b1c8e0feb567addb6dc0a7e2ca6ecdec
Commit: 21778867b1c8e0feb567addb6dc0a7e2ca6ecdec
Parent: d3a7b6df4951170079252402fd0c2dc70cb0ca2a
Author: Ingo Molnar <[EMAIL PROTECTED]>
AuthorDate: Fri Mar 16 13:38:31 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Mar 16 19:25:06 2007 -0700
[PATCH] futex: PI state locking fix
Testing of -rt by IBM uncovered a locking bug in wake_futex_pi(): the PI
state needs to be locked before we access it.
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Acked-by: Thomas Gleixner <[EMAIL PROTECTED]>
Cc: Chuck Ebbert <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
kernel/futex.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index e749e7d..5a270b5 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -565,6 +565,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval,
struct futex_q *this)
if (!pi_state)
return -EINVAL;
+ spin_lock(&pi_state->pi_mutex.wait_lock);
new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
/*
@@ -604,6 +605,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval,
struct futex_q *this)
pi_state->owner = new_owner;
spin_unlock_irq(&new_owner->pi_lock);
+ spin_unlock(&pi_state->pi_mutex.wait_lock);
rt_mutex_unlock(&pi_state->pi_mutex);
return 0;
-
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