Use f_lock to protect f_flags

[linux-flexiantxendom0-natty.git] / ipc / mqueue.c

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 54b4077..a8ddadb 100644 (file)
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1156,10 +1156,12 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
        omqstat.mq_flags = filp->f_flags & O_NONBLOCK;
        if (u_mqstat) {
                audit_mq_getsetattr(mqdes, &mqstat);
+               spin_lock(&filp->f_lock);
                if (mqstat.mq_flags & O_NONBLOCK)
                        filp->f_flags |= O_NONBLOCK;
                else
                        filp->f_flags &= ~O_NONBLOCK;
+               spin_unlock(&filp->f_lock);
 
                inode->i_atime = inode->i_ctime = CURRENT_TIME;
        }