[Bluetooth] Integrate services into the driver model

[pandora-kernel.git] / kernel / futex_compat.c

diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index d1d92b4..c5cca3f 100644 (file)
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -12,6 +12,23 @@
 
 #include <asm/uaccess.h>
 
+
+/*
+ * Fetch a robust-list pointer. Bit 0 signals PI futexes:
+ */
+static inline int
+fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry,
+                  compat_uptr_t *head, int *pi)
+{
+       if (get_user(*uentry, head))
+               return -EFAULT;
+
+       *entry = compat_ptr((*uentry) & ~1);
+       *pi = (unsigned int)(*uentry) & 1;
+
+       return 0;
+}
+
 /*
  * Walk curr->robust_list (very carefully, it's a userspace list!)
  * and mark any locks found there dead, and notify any waiters.
@@ -22,17 +39,16 @@ void compat_exit_robust_list(struct task_struct *curr)
 {
        struct compat_robust_list_head __user *head = curr->compat_robust_list;
        struct robust_list __user *entry, *pending;
+       unsigned int limit = ROBUST_LIST_LIMIT, pi, pip;
        compat_uptr_t uentry, upending;
-       unsigned int limit = ROBUST_LIST_LIMIT;
        compat_long_t futex_offset;
 
        /*
         * Fetch the list head (which was registered earlier, via
         * sys_set_robust_list()):
         */
-       if (get_user(uentry, &head->list.next))
+       if (fetch_robust_entry(&uentry, &entry, &head->list.next, &pi))
                return;
-       entry = compat_ptr(uentry);
        /*
         * Fetch the relative futex offset:
         */
@@ -42,11 +58,11 @@ void compat_exit_robust_list(struct task_struct *curr)
         * Fetch any possibly pending lock-add first, and handle it
         * if it exists:
         */
-       if (get_user(upending, &head->list_op_pending))
+       if (fetch_robust_entry(&upending, &pending,
+                              &head->list_op_pending, &pip))
                return;
-       pending = compat_ptr(upending);
        if (upending)
-               handle_futex_death((void *)pending + futex_offset, curr);
+               handle_futex_death((void *)pending + futex_offset, curr, pip);
 
        while (compat_ptr(uentry) != &head->list) {
                /*
@@ -55,15 +71,15 @@ void compat_exit_robust_list(struct task_struct *curr)
                 */
                if (entry != pending)
                        if (handle_futex_death((void *)entry + futex_offset,
-                                               curr))
+                                               curr, pi))
                                return;
 
                /*
                 * Fetch the next entry in the list:
                 */
-               if (get_user(uentry, (compat_uptr_t *)&entry->next))
+               if (fetch_robust_entry(&uentry, &entry,
+                                      (compat_uptr_t *)&entry->next, &pi))
                        return;
-               entry = compat_ptr(uentry);
                /*
                 * Avoid excessively long or circular lists:
                 */