diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
index 6bde18bcd42f..c72736f1571f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
@@ -394,7 +394,9 @@ struct mlx5_irq *mlx5_ctrl_irq_request(struct mlx5_core_dev *dev)
 		return ERR_PTR(-ENOMEM);
 	cpumask_copy(req_mask, cpu_online_mask);
 	if (!mlx5_irq_pool_is_sf_pool(pool)) {
-		/* In case we are allocating a control IRQ for PF/VF */
+		/* In case we are allocating a control IRQ from a pci device's pool.
+		 * This can happen also for a SF if the SFs pool is empty.
+		 */
 		if (!pool->xa_num_irqs.max) {
 			cpumask_clear(req_mask);
 			/* In case we only have a single IRQ for PF/VF */