1 files changed, 23 insertions, 38 deletions

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index e0a027d58dab..2d95f9db2598 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2091,22 +2091,34 @@ mark_lock_irq_used_in(struct task_struct *curr, struct held_lock *this,
 }
 
 static int
-mark_lock_irq_used_in_read(struct task_struct *curr, struct held_lock *this,
+mark_lock_irq_read(struct task_struct *curr, struct held_lock *this,
                            int new_bit)
 {
         const char *name = state_name(new_bit);
         const char *rname = state_rname(new_bit);
 
         int excl_bit = exclusive_bit(new_bit);
+        int dir = new_bit & 2;
 
         if (!valid_state(curr, this, new_bit, excl_bit))
                 return 0;
-        /*
-         * just marked it hardirq-read-safe, check that this lock
-         * took no hardirq-unsafe lock in the past:
-         */
-        if (!check_usage_forwards(curr, this, excl_bit, name))
-                return 0;
+
+        if (!dir) {
+                /*
+                 * just marked it hardirq-read-safe, check that this lock
+                 * took no hardirq-unsafe lock in the past:
+                 */
+                if (!check_usage_forwards(curr, this, excl_bit, name))
+                        return 0;
+        } else if (STRICT_READ_CHECKS) {
+                /*
+                 * just marked it hardirq-read-unsafe, check that no
+                 * hardirq-safe lock in the system ever took it in the past:
+                 */
+                if (!check_usage_backwards(curr, this, excl_bit, name))
+                        return 0;
+        }
+
         if (state_verbose(new_bit, hlock_class(this)))
                 return 2;
 
@@ -2147,31 +2159,6 @@ mark_lock_irq_enabled(struct task_struct *curr, struct held_lock *this,
         return 1;
 }
 
-static int
-mark_lock_irq_enabled_read(struct task_struct *curr, struct held_lock *this,
-                           int new_bit)
-{
-        const char *name = state_name(new_bit);
-        const char *rname = state_rname(new_bit);
-
-        int excl_bit = exclusive_bit(new_bit);
-
-        if (!valid_state(curr, this, new_bit, excl_bit))
-                return 0;
-#if STRICT_READ_CHECKS
-        /*
-         * just marked it hardirq-read-unsafe, check that no
-         * hardirq-safe lock in the system ever took it in the past:
-         */
-        if (!check_usage_backwards(curr, this, excl_bit, name))
-                return 0;
-#endif
-        if (verbose(hlock_class(this)))
-                return 2;
-
-        return 1;
-}
-
 static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
                 enum lock_usage_bit new_bit)
 {
@@ -2186,18 +2173,16 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
         case LOCK_USED_IN_HARDIRQ_READ:
         case LOCK_USED_IN_SOFTIRQ_READ:
         case LOCK_USED_IN_RECLAIM_FS_READ:
-                return mark_lock_irq_used_in_read(curr, this, new_bit);
+        case LOCK_ENABLED_HARDIRQ_READ:
+        case LOCK_ENABLED_SOFTIRQ_READ:
+        case LOCK_ENABLED_RECLAIM_FS_READ:
+                return mark_lock_irq_read(curr, this, new_bit);
 
         case LOCK_ENABLED_HARDIRQ:
         case LOCK_ENABLED_SOFTIRQ:
         case LOCK_ENABLED_RECLAIM_FS:
                 return mark_lock_irq_enabled(curr, this, new_bit);
 
-        case LOCK_ENABLED_HARDIRQ_READ:
-        case LOCK_ENABLED_SOFTIRQ_READ:
-        case LOCK_ENABLED_RECLAIM_FS_READ:
-                return mark_lock_irq_enabled_read(curr, this, new_bit);
-
         default:
                 WARN_ON(1);
                 break;