diff options
Diffstat (limited to 'include/linux/locks.h')
| -rw-r--r-- | include/linux/locks.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/locks.h b/include/linux/locks.h index 2094a4d19..9d342e669 100644 --- a/include/linux/locks.h +++ b/include/linux/locks.h @@ -29,7 +29,9 @@ extern inline void lock_buffer(struct buffer_head * bh) extern inline void unlock_buffer(struct buffer_head *bh) { clear_bit(BH_Lock, &bh->b_state); - wake_up(&bh->b_wait); + smp_mb__after_clear_bit(); + if (waitqueue_active(&bh->b_wait)) + wake_up(&bh->b_wait); } /* @@ -55,7 +57,12 @@ extern inline void lock_super(struct super_block * sb) extern inline void unlock_super(struct super_block * sb) { sb->s_lock = 0; - wake_up(&sb->s_wait); + /* + * No need of any barrier, we're protected by + * the big kernel lock here... unfortunately :) + */ + if (waitqueue_active(&sb->s_wait)) + wake_up(&sb->s_wait); } #endif /* _LINUX_LOCKS_H */ |