From f5adbfee72282bb1f456d52b04adacd4fe6ac502 Mon Sep 17 00:00:00 2001
From: Eran Ben Elisha <eranbe@mellanox.com>
Date: Thu, 12 Nov 2015 19:35:29 +0200
Subject: net/mlx4_core: Fix sleeping while holding spinlock at
 rem_slave_counters

When cleaning slave's counter resources, we hold a spinlock that
protects the slave's counters list. As part of the clean, we call
__mlx4_clear_if_stat which calls mlx4_alloc_cmd_mailbox which is a
sleepable function.

In order to fix this issue, hold the spinlock, and copy all counter
indices into a temporary array, and release the spinlock. Afterwards,
iterate over this array and free every counter. Repeat this scenario
until the original list is empty (a new counter might have been added
while releasing the counters from the temporary array).

Fixes: b72ca7e96acf ("net/mlx4_core: Reset counters data when freed")
Reported-by: Moni Shoua <monis@mellanox.com>
Tested-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
index 9813d34..6fec3e9 100644
--- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
+++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
@@ -4952,26 +4952,41 @@ static void rem_slave_counters(struct mlx4_dev *dev, int slave)
 	struct res_counter *counter;
 	struct res_counter *tmp;
 	int err;
-	int index;
+	int *counters_arr = NULL;
+	int i, j;
 
 	err = move_all_busy(dev, slave, RES_COUNTER);
 	if (err)
 		mlx4_warn(dev, "rem_slave_counters: Could not move all counters - too busy for slave %d\n",
 			  slave);
 
-	spin_lock_irq(mlx4_tlock(dev));
-	list_for_each_entry_safe(counter, tmp, counter_list, com.list) {
-		if (counter->com.owner == slave) {
-			index = counter->com.res_id;
-			rb_erase(&counter->com.node,
-				 &tracker->res_tree[RES_COUNTER]);
-			list_del(&counter->com.list);
-			kfree(counter);
-			__mlx4_counter_free(dev, index);
+	counters_arr = kmalloc_array(dev->caps.max_counters,
+				     sizeof(*counters_arr), GFP_KERNEL);
+	if (!counters_arr)
+		return;
+
+	do {
+		i = 0;
+		j = 0;
+		spin_lock_irq(mlx4_tlock(dev));
+		list_for_each_entry_safe(counter, tmp, counter_list, com.list) {
+			if (counter->com.owner == slave) {
+				counters_arr[i++] = counter->com.res_id;
+				rb_erase(&counter->com.node,
+					 &tracker->res_tree[RES_COUNTER]);
+				list_del(&counter->com.list);
+				kfree(counter);
+			}
+		}
+		spin_unlock_irq(mlx4_tlock(dev));
+
+		while (j < i) {
+			__mlx4_counter_free(dev, counters_arr[j++]);
 			mlx4_release_resource(dev, slave, RES_COUNTER, 1, 0);
 		}
-	}
-	spin_unlock_irq(mlx4_tlock(dev));
+	} while (i);
+
+	kfree(counters_arr);
 }
 
 static void rem_slave_xrcdns(struct mlx4_dev *dev, int slave)
-- 
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