Merge branch 'upstream'

[powerpc.git] / kernel / futex.c

diff --git a/kernel/futex.c b/kernel/futex.c
index ca05fe6..aca8d10 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -205,15 +205,13 @@ static int get_futex_key(unsigned long uaddr, union futex_key *key)
        /*
         * Do a quick atomic lookup first - this is the fastpath.
         */
-       spin_lock(&current->mm->page_table_lock);
-       page = follow_page(mm, uaddr, 0);
+       page = follow_page(mm, uaddr, FOLL_TOUCH|FOLL_GET);
        if (likely(page != NULL)) {
                key->shared.pgoff =
                        page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
-               spin_unlock(&current->mm->page_table_lock);
+               put_page(page);
                return 0;
        }
-       spin_unlock(&current->mm->page_table_lock);
 
        /*
         * Do it the general way.
@@ -367,6 +365,11 @@ retry:
                if (bh1 != bh2)
                        spin_unlock(&bh2->lock);
 
+               if (unlikely(op_ret != -EFAULT)) {
+                       ret = op_ret;
+                       goto out;
+               }
+
                /* futex_atomic_op_inuser needs to both read and write
                 * *(int __user *)uaddr2, but we can't modify it
                 * non-atomically.  Therefore, if get_user below is not