2 files changed, 19 insertions, 8 deletions

diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index a4023c2dd050..78038499cff5 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -118,6 +118,7 @@ struct mlx4_bitmap {
 
 struct mlx4_buddy {
         unsigned long         **bits;
+        unsigned int           *num_free;
         int                     max_order;
         spinlock_t              lock;
 };
diff --git a/drivers/net/mlx4/mr.c b/drivers/net/mlx4/mr.c
index 03a9abcce524..b3ea93b98689 100644
--- a/drivers/net/mlx4/mr.c
+++ b/drivers/net/mlx4/mr.c
@@ -79,23 +79,26 @@ static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
 
         spin_lock(&buddy->lock);
 
-        for (o = order; o <= buddy->max_order; ++o) {
-                m = 1 << (buddy->max_order - o);
-                seg = find_first_bit(buddy->bits[o], m);
-                if (seg < m)
-                        goto found;
-        }
+        for (o = order; o <= buddy->max_order; ++o)
+                if (buddy->num_free[o]) {
+                        m = 1 << (buddy->max_order - o);
+                        seg = find_first_bit(buddy->bits[o], m);
+                        if (seg < m)
+                                goto found;
+                }
 
         spin_unlock(&buddy->lock);
         return -1;
 
  found:
         clear_bit(seg, buddy->bits[o]);
+        --buddy->num_free[o];
 
         while (o > order) {
                 --o;
                 seg <<= 1;
                 set_bit(seg ^ 1, buddy->bits[o]);
+                ++buddy->num_free[o];
         }
 
         spin_unlock(&buddy->lock);
@@ -113,11 +116,13 @@ static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
 
         while (test_bit(seg ^ 1, buddy->bits[order])) {
                 clear_bit(seg ^ 1, buddy->bits[order]);
+                --buddy->num_free[order];
                 seg >>= 1;
                 ++order;
         }
 
         set_bit(seg, buddy->bits[order]);
+        ++buddy->num_free[order];
 
         spin_unlock(&buddy->lock);
 }
@@ -131,7 +136,9 @@ static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
 
         buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
                               GFP_KERNEL);
-        if (!buddy->bits)
+        buddy->num_free = kzalloc((buddy->max_order + 1) * sizeof (int *),
+                                  GFP_KERNEL);
+        if (!buddy->bits || !buddy->num_free)
                 goto err_out;
 
         for (i = 0; i <= buddy->max_order; ++i) {
@@ -143,6 +150,7 @@ static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
         }
 
         set_bit(0, buddy->bits[buddy->max_order]);
+        buddy->num_free[buddy->max_order] = 1;
 
         return 0;
 
@@ -150,9 +158,10 @@ err_out_free:
         for (i = 0; i <= buddy->max_order; ++i)
                 kfree(buddy->bits[i]);
 
+err_out:
         kfree(buddy->bits);
+        kfree(buddy->num_free);
 
-err_out:
         return -ENOMEM;
 }
 
@@ -164,6 +173,7 @@ static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
                 kfree(buddy->bits[i]);
 
         kfree(buddy->bits);
+        kfree(buddy->num_free);
 }
 
 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)