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Subject[PATCH 4.4 16/18] net/mlx4_core: Fix racy CQ (Completion Queue) free
4.4-stable review patch.  If anyone has any objections, please let me know.


From: Jack Morgenstein <>

commit 291c566a28910614ce42d0ffe82196eddd6346f4 upstream.

In function mlx4_cq_completion() and mlx4_cq_event(), the
radix_tree_lookup requires a rcu_read_lock.
This is mandatory: if another core frees the CQ, it could
run the radix_tree_node_rcu_free() call_rcu() callback while
its being used by the radix tree lookup function.

Additionally, in function mlx4_cq_event(), since we are adding
the rcu lock around the radix-tree lookup, we no longer need to take
the spinlock. Also, the synchronize_irq() call for the async event
eliminates the need for incrementing the cq reference count in

Other changes:
1. In function mlx4_cq_free(), replace spin_lock_irq with spin_lock:
we no longer take this spinlock in the interrupt context.
The spinlock here, therefore, simply protects against different
threads simultaneously invoking mlx4_cq_free() for different cq's.

2. In function mlx4_cq_free(), we move the radix tree delete to before
the synchronize_irq() calls. This guarantees that we will not
access this cq during any subsequent interrupts, and therefore can
safely free the CQ after the synchronize_irq calls. The rcu_read_lock
in the interrupt handlers only needs to protect against corrupting the
radix tree; the interrupt handlers may access the cq outside the
rcu_read_lock due to the synchronize_irq calls which protect against
premature freeing of the cq.

3. In function mlx4_cq_event(), we change the mlx_warn message to mlx4_dbg.

4. We leave the cq reference count mechanism in place, because it is
still needed for the cq completion tasklet mechanism.

Fixes: 6d90aa5cf17b ("net/mlx4_core: Make sure there are no pending async events when freeing CQ")
Fixes: 225c7b1feef1 ("IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters")
Signed-off-by: Jack Morgenstein <>
Signed-off-by: Matan Barak <>
Signed-off-by: Tariq Toukan <>
Signed-off-by: David S. Miller <>
Signed-off-by: Sumit Semwal <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/net/ethernet/mellanox/mlx4/cq.c | 38 ++++++++++++++++----------------
1 file changed, 20 insertions(+), 18 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx4/cq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cq.c
@@ -101,13 +101,19 @@ void mlx4_cq_completion(struct mlx4_dev
struct mlx4_cq *cq;

+ rcu_read_lock();
cq = radix_tree_lookup(&mlx4_priv(dev)->cq_table.tree,
cqn & (dev->caps.num_cqs - 1));
+ rcu_read_unlock();
if (!cq) {
mlx4_dbg(dev, "Completion event for bogus CQ %08x\n", cqn);

+ /* Acessing the CQ outside of rcu_read_lock is safe, because
+ * the CQ is freed only after interrupt handling is completed.
+ */

@@ -118,23 +124,19 @@ void mlx4_cq_event(struct mlx4_dev *dev,
struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
struct mlx4_cq *cq;

- spin_lock(&cq_table->lock);
+ rcu_read_lock();
cq = radix_tree_lookup(&cq_table->tree, cqn & (dev->caps.num_cqs - 1));
- if (cq)
- atomic_inc(&cq->refcount);
- spin_unlock(&cq_table->lock);
+ rcu_read_unlock();

if (!cq) {
- mlx4_warn(dev, "Async event for bogus CQ %08x\n", cqn);
+ mlx4_dbg(dev, "Async event for bogus CQ %08x\n", cqn);

+ /* Acessing the CQ outside of rcu_read_lock is safe, because
+ * the CQ is freed only after interrupt handling is completed.
+ */
cq->event(cq, event_type);
- if (atomic_dec_and_test(&cq->refcount))
- complete(&cq->free);

static int mlx4_SW2HW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
@@ -301,9 +303,9 @@ int mlx4_cq_alloc(struct mlx4_dev *dev,
if (err)
return err;

- spin_lock_irq(&cq_table->lock);
+ spin_lock(&cq_table->lock);
err = radix_tree_insert(&cq_table->tree, cq->cqn, cq);
- spin_unlock_irq(&cq_table->lock);
+ spin_unlock(&cq_table->lock);
if (err)
goto err_icm;

@@ -347,9 +349,9 @@ int mlx4_cq_alloc(struct mlx4_dev *dev,
return 0;

- spin_lock_irq(&cq_table->lock);
+ spin_lock(&cq_table->lock);
radix_tree_delete(&cq_table->tree, cq->cqn);
- spin_unlock_irq(&cq_table->lock);
+ spin_unlock(&cq_table->lock);

mlx4_cq_free_icm(dev, cq->cqn);
@@ -368,15 +370,15 @@ void mlx4_cq_free(struct mlx4_dev *dev,
if (err)
mlx4_warn(dev, "HW2SW_CQ failed (%d) for CQN %06x\n", err, cq->cqn);

+ spin_lock(&cq_table->lock);
+ radix_tree_delete(&cq_table->tree, cq->cqn);
+ spin_unlock(&cq_table->lock);
if (priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(cq->vector)].irq !=

- spin_lock_irq(&cq_table->lock);
- radix_tree_delete(&cq_table->tree, cq->cqn);
- spin_unlock_irq(&cq_table->lock);
if (atomic_dec_and_test(&cq->refcount))

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